Mammals · Primates · Big cats · Marsupials
Mammal Facts Answered
Mammals are warm-blooded vertebrates with fur and milk production — from the 2-gram bumblebee bat to the blue whale. This hub answers 12 common mammal questions with sourced facts and links to 208 WARN wildlife guides.
- ~6,400
- Living mammal species recognised worldwide
- 1,300+
- Mammal species listed as threatened on the IUCN Red ListSource: IUCN Red List
- ~60%
- Primate species at risk — highest share of any mammal groupSource: IUCN Primate Specialist Group
- 180 t
- Maximum mass of the blue whale — largest mammal ever
Seven mammal questions answered
Direct answers for search and AI Overviews — each links to a full briefing.
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What is a mammal?
Mammals are warm-blooded vertebrates with hair or fur, three middle-ear bones, and females that produce milk to nurse young. Humans, dogs, whales, bats and elephants are all mammals.
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Are bats mammals?
Yes. Bats are mammals — the only mammals capable of true powered flight. They nurse pups with milk and are warm-blooded.
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Do any mammals lay eggs?
Yes. Monotremes — the platypus and four echidna species — lay leathery eggs and are the only egg-laying mammals. They still nurse young with milk.
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What is the largest land mammal?
The African bush elephant (Loxodonta africana) is the largest land mammal — bulls can exceed 6 tonnes and 3.3 metres at the shoulder. Asian elephants are slightly smaller.
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What is the smallest mammal?
The Kitti’s hog-nosed bat (bumblebee bat) of Thailand and Myanmar weighs about 2 grams — the smallest mammal by mass. The Etruscan shrew rivals it for smallest body length.
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Why are big cats endangered?
Big cats — lions, tigers, leopards, jaguars, cheetahs and snow leopards — face habitat loss, prey depletion, poaching for skins and bones, and retaliatory killing after livestock attacks.
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How long do elephants live?
Wild African elephants often live 60–70 years; Asian elephants typically 48–60 years. Captive elephants may live longer with veterinary care but face welfare challenges in inadequate facilities.
Read full answer →
Mammal FAQs
- What defines a mammal?
- Hair or fur, three middle-ear bones, and females that produce milk. Most give live birth; monotremes (platypus, echidnas) lay eggs but still nurse young.
- Which mammal group is most threatened?
- Primates have the highest share of threatened species — about 60% of primate species are at risk on the IUCN Red List, driven by deforestation, bushmeat hunting and the pet trade.
- Are whales and bats mammals?
- Yes. Both are mammals. Whales nurse calves with milk; bats are the only mammals capable of true powered flight.
- How can I help threatened mammals?
- Fund habitat protection and anti-poaching through vetted partners, reduce demand for illegal wildlife products, and support CNVR and sanctuary programmes for species that cannot return to the wild.
Mammal wildlife guides
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Not Evaluated
Aardvark
The aardvark (Orycteropus afer) is the only living species of its order, a nocturnal insectivore of sub-Saharan Africa listed as Least Concern; it digs for termites and its burrows shelter dozens of other species.
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Endangered
African Wild Dog
The African wild dog is a lean, long-legged carnivore of sub-Saharan Africa, famous for its mottled coat of black, tan, and white patches. Weighing 20 to 30 kg and standing about 1.1 m in body length, it is one of the world's most efficient pack hunters, chasing prey at up to 60 km/h.
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Not Evaluated
Alpaca
The alpaca (Vicugna pacos) is a domesticated Andean camelid kept for its fine fleece; descended from the vicuña, it has been farmed for over 6,000 years in Peru, Bolivia and neighbouring countries.
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Near Threatened
American Bison
The American bison is the largest land mammal in North America, listed as Near Threatened by the IUCN with an estimated 15,000 truly wild individuals remaining after a dramatic near-extinction in the 19th century.
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Endangered
Anoa
Anoa are dwarf buffalo endemic to Sulawesi, Indonesia — the smallest wild cattle at roughly 90 cm shoulder height — with lowland and mountain species both listed Endangered and declining through hunting and forest loss.
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Not Evaluated
Antelope
Antelope are horned ruminants of the family Bovidae — roughly 90 species across Africa and Asia; African savanna antelope form the prey base for the continent's great predators, with conservation status ranging from abundant to Critically Endangered.
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Vulnerable
Arabian Oryx
The Arabian oryx (Oryx leucoryx) is a desert antelope of the Arabian Peninsula that was Extinct in the Wild by the 1970s and restored through captive breeding and reintroduction; it is now Vulnerable with a growing but still small wild population.
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Least Concern
Arctic Fox
The Arctic fox (Vulpes lagopus) has the warmest coat of any mammal, does not begin shivering until around −40°C, and changes from a brown-grey summer coat to thick white winter fur; its main modern threat is the red fox expanding north.
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Not Evaluated
Armadillo
An armadillo is a small to medium New World mammal of the order Cingulata, protected by a distinctive shell of bony plates covered in leathery skin. Around 20 species live across the Americas, digging burrows and feeding mainly on insects, grubs and other invertebrates.
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Endangered
Aye-aye
The aye-aye is a large nocturnal lemur found only in Madagascar, easily recognised by its bushy tail, rodent-like teeth and long, spindly middle finger. It weighs 2 to 3 kg (4.4 to 6.6 lb) and forages alone at night for insect larvae, fruit, nectar and fungi.
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Vulnerable
Babirusa
Babirusas are forest pigs of Sulawesi and Wallacea whose males grow upper canines that pierce the snout roof and curve upward; they are listed Vulnerable, threatened by hunting and forest loss.
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Not Evaluated
Baboon
Baboons are large Old World monkeys of the genus Papio, living in complex social troops across African savanna and desert; most species are Least Concern but face habitat loss and conflict with agriculture.
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Not Evaluated
Badger
The European badger (Meles meles) is a Least Concern mustelid of European and Asian woodlands, living in social groups in extensive underground setts and feeding on earthworms, fruit and small vertebrates.
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Not Evaluated
Bandicoot
Bandicoots are small marsupials of the order Peramelemorphia with gestation as short as about twelve days, a unusually advanced marsupial placenta, and a rearward-opening pouch; the name covers many species across Australia, New Guinea and Wallacea with varying IUCN status.
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Endangered
Banteng
The banteng (Bos javanicus) is an Endangered wild cattle of Southeast Asia; the first Endangered species cloned successfully in 2003, it continues to decline as oil palm, pulpwood, mining and hunting remove forest across Sundaland.
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Not Evaluated
Bat
Bats (order Chiroptera) are the only mammals capable of true flight, with around 1,400 species worldwide that mostly navigate by echolocation and provide vital pest control, pollination, and seed dispersal.
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Not Evaluated
Bear
Bears are eight living species in the family Ursidae across North America, South America, Europe and Asia; conservation status ranges from abundant (American black bear) to Vulnerable (polar bear, sun bear) to dependent on intensive protection (giant panda).
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Not Evaluated
Beaver
Beavers are Least Concern rodents of the genus Castor — the Eurasian and American species build dams and lodges that create wetlands supporting fish, birds and amphibians; Eurasian beavers recovered from near extinction through reintroduction.
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Not Evaluated
Beluga Whale
The beluga whale is a small, all-white Arctic cetacean renowned for its extraordinary vocal range, flexible neck and ability to navigate beneath sea ice, currently assessed as Least Concern overall by the IUCN but with several regional populations in serious decline.
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Vulnerable
Bilby
The greater bilby (Macrotis lagotis) is a Vulnerable, nocturnal, burrowing marsupial of arid Australia with long ears and silky fur; fewer than 10,000 mature individuals remain after foxes, cats and habitat loss removed it from most of its former range across the mainland.
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Vulnerable
Binturong
The binturong (Arctictis binturong) is a Vulnerable tree-dwelling viverrid of South-east Asian rainforest, the only Old World mammal with a fully prehensile tail; it is threatened by deforestation and the illegal pet trade.
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Not Evaluated
Black Bear
The American black bear (Ursus americanus) is listed as Least Concern by the IUCN, with an estimated 800,000+ individuals across North America — the continent's most common and widespread bear species.
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Critically Endangered
Black Rhinoceros
The black rhinoceros is a large African rhino with a hooked upper lip for browsing shrubs, weighing 800–1,400 kg (1,750–3,100 lb) despite its name referring to soil colour, not hide. Critically endangered from poaching for horn, fewer than 6,500 remain across scattered eastern and southern African reserves.
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Endangered
Blue Whale
The blue whale (Balaenoptera musculus) is the Endangered largest animal on Earth — a krill-filtering baleen whale found in all oceans, recovering slowly after twentieth-century whaling.
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Not Evaluated
Bobcat
The bobcat (Lynx rufus) is a medium-sized North American wild cat listed as Least Concern by the IUCN; it is the continent's most widespread and adaptable felid, recognised by its tufted ears, spotted coat and short tail.
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Endangered
Bonobo
Bonobos are great apes found only in the Democratic Republic of Congo, closely related to chimpanzees but generally less aggressive, with female-led social bonds and extensive use of social behaviour to resolve conflict. Listed Endangered, they weigh 30–50 kg and face habitat loss and bushmeat hunting.
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Vulnerable
Bornean Bearded Pig
The Bornean bearded pig (Sus barbatus) is a Vulnerable wild pig of Borneo known for mass migrations; populations collapsed after African swine fever spread from around 2020, on top of oil palm, pulpwood and mining-driven forest loss.
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Endangered
Borneo Pygmy Elephant
A Borneo pygmy elephant is the smallest subspecies of Asian elephant (Elephas maximus borneensis), native to the island of Borneo in Sabah, Malaysia and Kalimantan, Indonesia; the IUCN listed it as Endangered in 2024 with about 1,000 left in the wild.
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Least Concern
Brown Bear
The brown bear is one of the world's largest land carnivores, found across North America, Europe, and Asia. Adults typically weigh 130–360 kg (290–800 lb), run up to 56 km/h (35 mph), and hibernate through winter in dens.
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Not Evaluated
Brown Rat
A brown rat (Rattus norvegicus) is a large, adaptable rodent that lives alongside humans worldwide. Native to Asia, it has spread to every continent except Antarctica. Highly intelligent and social, it is the wild ancestor of both pet "fancy rats" and laboratory rats, and is listed as Least Concern.
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Near Threatened
Buffalo
The African buffalo (Syncerus caffer) is a Near Threatened bovid of sub-Saharan Africa — a 900 kg herd grazer and formidable prey for lions, with roughly 400,000 individuals; Asian wild water buffalo is a separate Endangered species.
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Least Concern
Bushbaby
Bushbabies (family Galagidae) are small nocturnal primates of sub-Saharan Africa; the Senegal bushbaby (Galago senegalensis) weighs under 300 g, has eyes roughly the size of its brain, and can leap six metres between branches.
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Not Evaluated
Camel
A camel is a large, hump-backed desert mammal of the genus Camelus. The one-humped dromedary and two-humped Bactrian are domesticated; the wild Bactrian camel is rare. Humps store fat, not water, and remarkable adaptations let camels endure extreme heat and long stretches without drinking.
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Least Concern
Capuchin Monkey
The capuchin is a small, highly intelligent New World monkey found in the tropical forests of Central America and northwest South America. Weighing about 3 to 4 kg and measuring roughly half a metre in body length, it is an agile tree-dweller that uses its prehensile tail for balance.
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Not Evaluated
Capybara
A capybara is the world's largest rodent, a semi-aquatic, plant-eating mammal native to South America that can weigh up to about 65 kilograms (140 pounds) and lives in social groups near rivers, lakes and wetlands.
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Not Evaluated
Caracal
The caracal is a medium-sized wild cat native to Africa, the Middle East, and South Asia, classified as Least Concern globally by the IUCN but critically threatened in parts of Asia, including Pakistan, where fewer than 150 individuals may remain.
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Not Evaluated
Cat
A cat (Felis catus) is a small domesticated carnivorous mammal descended from the African wildcat; kept worldwide as a companion animal, it is an obligate carnivore that typically lives about 12–18 years and exists in dozens of recognised breeds, though most pet cats are non-pedigreed domestic shorthairs.
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Vulnerable
Cheetah
The cheetah (Acinonyx jubatus) is the fastest land animal, reaching roughly 100-120 km/h (about 60-75 mph) in short bursts, and is classified as Vulnerable by the IUCN, with the Asiatic cheetah in Iran listed as Critically Endangered.
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Not Evaluated
Chevrotain
Chevrotains are tiny Tragulidae hoofed mammals called mouse-deer but not related to deer; the silver-backed chevrotain was rediscovered in Vietnam in 2019 on camera trap after decades without confirmed records.
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Endangered
Chimpanzee
A chimpanzee (Pan troglodytes) is a great ape from the forests and woodlands of equatorial Africa. Along with the bonobo, it is humans' closest living relative, sharing roughly 98-99% of our DNA. Famous for tool use, complex societies and culture, it is classified as Endangered.
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Not Evaluated
Chinchilla
A chinchilla is a small, soft-furred rodent of the genus Chinchilla, native to the Andes mountains of South America. Famous for the densest fur of any land mammal, both wild species are Endangered, yet chinchillas are also bred and kept worldwide as long-lived, dust-bathing pets.
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Not Evaluated
Chipmunk
Chipmunks are small striped rodents of the subtribe Tamiina — found across North America and in one Asian species — that are mostly Least Concern on the IUCN Red List, though one New Mexico subspecies was listed as Endangered under the US Endangered Species Act in December 2024.
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Not Evaluated
Civet
Civets are nocturnal viverrids of Africa and Asia; the African civet (Civettictis civetta) is Least Concern and widespread across sub-Saharan Africa, though Asian species face habitat loss and civet musk farming raises welfare concerns.
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Vulnerable
Clouded Leopard
A clouded leopard is a medium-sized arboreal wild cat native to the forests of Asia, recognised by its cloud-shaped coat patches and famous for having the longest canine teeth relative to body size of any living cat; two species exist, the mainland (Neofelis nebulosa) and Sunda (Neofelis diardi) clouded leopards, both listed as Vulnerable.
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Least Concern
Colugo
The Sunda colugo (Galeopterus variegatus) is a nocturnal gliding mammal of Borneo and Sumatra with the most extensive gliding membrane of any mammal; it is not a lemur and cannot fly, and its closest living relatives are primates.
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Not Evaluated
Cougar
The cougar (Puma concolor) — also known as puma or mountain lion — is a large solitary cat native to the Americas, listed as Least Concern by the IUCN; it is the most widespread wild cat in the Western Hemisphere but faces habitat loss and human conflict in many regions.
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Not Evaluated
Cow
Cattle (Bos taurus) are domesticated descendants of extinct aurochs — social herd animals raised for milk and meat; industrial systems impose calf separation, repeated pregnancy and early culling despite natural lifespans of 15–20 years.
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Not Evaluated
Coyote
The coyote (Canis latrans) is a highly adaptable wild canid found across North and Central America — from Alaska to Panama — where it plays a vital role controlling rodent populations and is classified as Least Concern by the IUCN with a stable and expanding population.
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Critically Endangered
Crested Black Macaque
The crested black macaque (Macaca nigra) is a Critically Endangered all-black monkey endemic to northeastern Sulawesi, threatened by hunting and forest loss; it became famous through 2011 selfie photographs, but copyright law does not protect the species from decline.
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Not Evaluated
Deer
Deer are antlered, hoofed ruminant mammals of the family Cervidae, comprising about 50 species worldwide; most are Least Concern, but several, including Père David's deer (Extinct in the Wild) and the hog deer, are threatened.
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Endangered
Dhole
The dhole (Cuon alpinus) is an Endangered wild canid of South and Southeast Asian forests that hunts deer and wild pig in coordinated packs, communicates with whistles rather than barks, and is declining across most of its range.
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Vulnerable
Dingo
The dingo is Australia's native wild dog and apex predator, historically classified as Vulnerable due to widespread persecution and hybridisation with domestic dogs — though it was removed from the IUCN Red List in 2019 following taxonomic reclassification, and new genomic research suggests pure dingoes are more numerous than previously feared.
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Not Evaluated
Dog
A dog (Canis lupus familiaris) is a domesticated mammal descended from the grey wolf, kept worldwide as a companion, working, and assistance animal; it is the same species across every breed, from the Chihuahua to the Great Dane.
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Not Evaluated
Dolphin
Oceanic dolphins (family Delphinidae) include the common bottlenose and common dolphin — social toothed whales of seas worldwide, distinct from river dolphins; IUCN status ranges from Least Concern to Critically Endangered by species.
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Not Evaluated
Donkey
Donkeys (Equus asinus) are domestic equids used worldwide for transport and companionship — their wild ancestor is Critically Endangered; millions are killed yearly for the ejiao skin trade.
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Vulnerable
Dugong
A dugong is a large, plant-eating marine mammal of the order Sirenia (the "sea cows"), reaching about 3 metres long, that lives entirely in warm coastal seas and feeds almost exclusively on seagrass.
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Not Evaluated
Echidna
The short-beaked echidna is an egg-laying mammal native to Australia and New Guinea, recognisable by its sharp spines, elongated snout, and extraordinary ability to sense prey through electric fields — making it one of the most evolutionarily ancient and biologically unique mammals alive today.
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Endangered
Elephant
Asian elephants are Endangered; their main threats are habitat loss and human-elephant conflict, while African elephants also face poaching for the illegal ivory trade.
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Not Evaluated
Elk (Wapiti)
The elk (Cervus canadensis) is a Least Concern deer species numbering over one million in North America, renowned for its towering antlers, powerful bugle call, and remarkable recovery from near-extinction in the early twentieth century.
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Near Threatened
European Bison
The European bison (Bison bonasus) is Europe's largest land mammal, restored from around fifty-four captive animals when the last wild individual died in 1927 to more than 6,800 wild bison today through captive breeding and reintroduction.
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Not Evaluated
European Mole
The European mole (Talpa europaea) is a small, burrowing insectivorous mammal with velvety fur, tiny eyes and powerful spade-like forepaws. It lives almost entirely underground, hunting earthworms in self-dug tunnels across Europe and western Asia, and is best known for the molehills it pushes to the surface.
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Least Concern
Fennec Fox
The fennec fox (Vulpes zerda) is the world's smallest fox, native to the Sahara, whose oversized ears act as heat radiators and which can survive without drinking free water by extracting moisture from its food.
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Not Evaluated
Ferret
A ferret (Mustela furo) is a domesticated member of the weasel family, bred from the European polecat about 2,500 years ago. Long-bodied, playful and carnivorous, it has long been used to hunt rabbits and is today a popular household pet, typically living seven to ten years.
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Vulnerable
Fin Whale
The fin whale is the second-largest animal on Earth after the blue whale, reaching 25 m (82 ft) and 70 tonnes with an asymmetric jaw colouring. A fast baleen whale capable of 40 km/h bursts, it filters krill and small fish and is listed Vulnerable after decades of commercial whaling.
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Vulnerable
Fishing Cat
The fishing cat (Prionailurus viverrinus) is a Vulnerable wetland felid of South and Southeast Asia that swims and dives to catch fish, with partially webbed toes and a stocky build adapted to marsh, mangrove and reedbed habitat.
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Least Concern
Flying Squirrel
Flying squirrels are over 50 species of nocturnal gliding rodents with a skin membrane between wrists and ankles; they cannot truly fly, and a 2019 study found that all three North American Glaucomys species fluoresce pink under ultraviolet light.
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Vulnerable
Fossa
The fossa (Cryptoprocta ferox) is Madagascar's largest native carnivore and apex predator, cat-like in appearance but a euplerid mongoose relative; it hunts lemurs in the canopy, is listed Vulnerable, and declines as an estimated 80–90% of Madagascar's original forest has been lost.
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Vulnerable
Gaur
The gaur (Bos gaurus) is a Vulnerable forest bovid — the largest wild cattle species, ranging from India through Malaysia; threatened by habitat loss, bushmeat hunting and agricultural encroachment.
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Not Evaluated
Gazelle
Gazelles are small swift antelopes of Africa and Asia; Thomson's gazelle (Eudorcas thomsonii) of East Africa is Least Concern with roughly 500,000 individuals and is the cheetah's primary prey.
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Vulnerable
Giant Anteater
The giant anteater is a large, toothless mammal of Central and South America listed as Vulnerable by the IUCN, with populations declining by at least 30% over the past three generations due to habitat loss, fire, and road mortality.
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Endangered
Giant Otter
A giant otter (Pteronura brasiliensis) is the world's longest otter, a fish-eating, highly social mammal of South American rivers that grows up to 1.8 metres long and lives in family groups; it is classified as Endangered by the IUCN.
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Vulnerable
Giant Panda
The giant panda (Ailuropoda melanoleuca) is a bamboo-eating bear native only to China, listed as Vulnerable on the IUCN Red List with roughly 1,800 to 1,900 mature individuals in the wild as of the 2016 assessment.
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Not Evaluated
Gibbon
Gibbons are tailless lesser apes of South-east Asian rainforest, brachiating through the canopy in monogamous family groups; most species are Endangered or Critically Endangered due to habitat loss and the illegal pet trade.
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Vulnerable
Giraffe
Giraffes are the tallest animals on Earth and are listed as Vulnerable on the IUCN Red List; the group was split into four species in 2025, and while overall numbers are now near 117,000, some subspecies such as the Kordofan and Nubian giraffe are Critically Endangered.
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Not Evaluated
Goat
Goats (Capra hircus) are intelligent browsing livestock domesticated from Near Threatened bezoar ibex — need companions, climbing enrichment and hoof care; tethering and solitary keeping cause severe welfare harm.
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Endangered
Golden Lion Tamarin
A golden lion tamarin (Leontopithecus rosalia) is a small, endangered New World monkey with a bright reddish-gold coat and a lion-like mane, native only to the Atlantic Forest of southeastern Brazil.
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Endangered
Golden Snub-Nosed Monkey
The golden snub-nosed monkey (Rhinopithecus roxellana) is an Endangered Old World monkey of central China's mountain forests, famous for its golden fur, pale blue face and upturned nose; it lives in large social groups and is protected under CITES Appendix I.
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Critically Endangered
Gorilla
A gorilla is the largest living primate, a ground-dwelling, mostly plant-eating great ape native to the forests of equatorial Africa. There are two Critically Endangered species — the Western and Eastern gorilla — and gorillas share roughly 98% of their DNA with humans.
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Least Concern
Gray Whale
The gray whale migrates up to around 20,000 km a year between Arctic feeding grounds and Mexican calving lagoons, and is the only baleen whale that feeds mainly by rolling on the seabed to filter sediment.
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Least Concern
Grey Cuscus
The grey cuscus (Phalanger orientalis) is a slow, nocturnal, tree-dwelling marsupial of New Guinea and nearby islands; it is a possum rather than a primate, and archaeological evidence shows people were deliberately moving it between islands around 20,000 years ago.
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Least Concern
Grey Seal
The grey seal (Halichoerus grypus) is a large North Atlantic seal named for its long, horse-like muzzle. It swims after fish, squid, and crustaceans along rocky coasts, islands, and ice edges, and a big bull can weigh up to 230 kg.
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Not Evaluated
Grey Wolf
The grey wolf (Canis lupus) is the largest wild dog and the ancestor of the domestic dog; it is listed as Least Concern globally with an estimated 200,000–250,000 in the wild, but remains locally endangered or extinct across much of its former range.
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Not Evaluated
Grizzly Bear
The grizzly bear (Ursus arctos horribilis) is a North American brown bear subspecies; the brown bear is Least Concern globally, but grizzlies in the contiguous United States are protected under the Endangered Species Act with roughly 1,900 individuals south of Canada.
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Not Evaluated
Groundhog
A groundhog (Marmota monax) is a large North American ground squirrel, or marmot, in the squirrel family. A stout, powerful burrower and true hibernator weighing up to about 6 kilograms, it lives across the eastern United States and Canada and is famous for Groundhog Day.
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Not Evaluated
Guinea Pig
The guinea pig (Cavia porcellus) is a domesticated South American rodent that must live with companions, needs daily vitamin C and spacious enclosures — not solitary confinement in small hutches.
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Vulnerable
Hamster
Hamsters are nocturnal cricetine rodents — Syrian hamsters must live alone; dwarf species may tolerate pairs. Wild Syrian hamsters are Vulnerable; pet welfare requires large enclosures, deep bedding and wheels with a straight back.
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Not Evaluated
Hare
Hares (genus Lepus, ~32 species) are large, fast-running lagomorphs found across Europe, Asia, Africa, and the Americas, most classified as Least Concern by the IUCN, though European hare populations have declined significantly since the 1960s due to agricultural intensification.
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Not Evaluated
Hazel Dormouse
The hazel dormouse (Muscardinus avellanarius) is a small golden-brown European rodent, weighing about 17-20 g, that lives in woodland and hedgerows. Nocturnal and arboreal, it eats flowers, fruit, nuts and insects, and hibernates for roughly half the year, from autumn until spring.
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Not Evaluated
Hedgehog
A hedgehog is a small spiny insectivorous mammal of the subfamily Erinaceinae; there are 17 species across Europe, Asia and Africa, and the widespread European hedgehog was listed as Near Threatened on the IUCN Red List in 2024 after sharp declines.
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Not Evaluated
Himalayan Brown Bear
A Himalayan brown bear (Ursus arctos isabellinus) is a high-altitude subspecies of brown bear native to the western Himalayas of Pakistan, India and Nepal, recognisable by its sandy to reddish-brown coat and considered Critically Endangered within Pakistan even though the wider brown bear species is listed as Least Concern globally.
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Vulnerable
Hippopotamus
The hippopotamus (Hippopotamus amphibius) is a large semi-aquatic African mammal listed as Vulnerable by the IUCN, with roughly 115,000-130,000 individuals remaining and a declining population driven by habitat loss and demand for its tooth ivory.
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Least Concern
Honey Badger
The honey badger (Mellivora capensis) is a stocky African and Asian mustelid with exceptionally thick, loose skin that lets it twist within its own hide when gripped, a partial tolerance to snake venom, and well-documented problem-solving and escape ability.
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Not Evaluated
Horse
The horse (Equus ferus caballus) is a domesticated mammal kept worldwide for transport, work, sport and companionship; it is not a threatened species, but the welfare of the tens of millions of working horses in lower-income countries is a serious global concern.
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Not Evaluated
House Mouse
A house mouse (Mus musculus) is a small grey-brown rodent in the family Muridae, typically 7.5–10 cm long with a long tail and large ears. Native to Asia, it now lives worldwide alongside humans, breeds prolifically, and is the ancestor of pet and laboratory mice.
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Least Concern
Howler Monkey
The howler monkey is a large, leaf-eating New World primate famous for having one of the loudest calls of any land animal in the Americas. Living in the tropical forests of Central and South America, it weighs around 5 to 10 kg and spends almost its whole life high in the canopy.
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Not Evaluated
Humpback Whale
A humpback whale (Megaptera novaeangliae) is a large filter-feeding baleen whale found in oceans worldwide, known for its long pectoral fins, acrobatic breaching, and the complex songs sung by males during the breeding season.
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Not Evaluated
Hyena
The spotted hyena (Crocuta crocuta) is Africa's most common large carnivore, living in matriarchal clans on the savanna; listed as Least Concern, it is a skilled hunter — not merely a scavenger — facing persecution and habitat loss.
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Not Evaluated
Ibex
Ibex are wild mountain goats of the genus Capra; the Alpine ibex (Capra ibex) is Least Concern after recovery from near extinction, with males carrying curved horns up to a metre long on cliffs across Europe and Asia.
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Not Evaluated
Impala
The impala (Aepyceros melampus) is Africa's most widespread medium-sized antelope, listed as Least Concern; it inhabits savanna woodland across eastern and southern Africa and is a keystone prey species for major predators.
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Endangered
Indus River Dolphin
The Indus River dolphin (Platanista minor), or bhulan, is a small, nearly blind freshwater dolphin found only in the Indus River system of Pakistan; it is the national mammal of Pakistan and is classified as Endangered, with fewer than about 2,000 mature individuals remaining.
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Not Evaluated
Jackal
The golden jackal (Canis aureus) is a Least Concern wild canid ranging from Africa through the Middle East to Pakistan and Nepal — an adaptable omnivore of savanna, scrub and farmland.
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Near Threatened
Jaguar
A jaguar (Panthera onca) is a large spotted big cat native to the Americas — the largest cat on the continent and the third-largest in the world — known for the strongest bite of any big cat and a habit of killing prey by piercing the skull.
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Critically Endangered
Javan Rhino
The Javan rhinoceros is the rarest of all rhino species, with roughly 70 individuals surviving in a single national park on Java, Indonesia. Smaller than the Indian rhino at 900–2,300 kg (2,000–5,000 lb), it has a single horn and nearly hairless grey skin, and is Critically Endangered from historic hunting and tiny range.
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Not Evaluated
Kangaroo
A kangaroo is a large hopping marsupial native to Australia and the world's biggest marsupial, carrying its young, called a joey, in a pouch; the main kangaroo species are widespread and assessed as Least Concern.
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Least Concern
Kinkajou
The kinkajou (Potos flavus) is a nocturnal Central and South American rainforest mammal in the raccoon family, one of only two carnivorans with a fully prehensile tail, feeding mainly on fruit and nectar and acting as an incidental pollinator.
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Vulnerable
Koala
The koala is a Vulnerable eucalyptus-eating marsupial native only to Australia, where habitat loss, disease and bushfire have made its eastern populations Endangered under national law as of 2022.
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Least Concern
Lemming
Lemmings are small Arctic rodents in the family Cricetidae whose populations boom and crash on a roughly three-to-four-year cycle; they do not commit mass suicide — the famous cliff-dive footage was staged for Disney's 1958 film White Wilderness.
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Not Evaluated
Lemur
A lemur is a primate native only to Madagascar and nearby islands, forming the group Lemuriformes. More than 100 species exist, from tiny mouse lemurs to the familiar ring-tailed lemur. Most are tree-dwelling, and lemurs are the most endangered mammal group on Earth.
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Not Evaluated
Leopard
Leopards are spotted Panthera cats of Africa and Asia — Vulnerable (Panthera pardus) — plus clouded leopards and snow leopards as distinct species covered in separate WARN guides.
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Vulnerable
Lion
The lion (Panthera leo) is classified as Vulnerable on the IUCN Red List, with an estimated 23,000 mature and subadult lions remaining in Africa plus around 670 in India, and the overall population is decreasing.
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Not Evaluated
Llama
The llama (Lama glama) is a domesticated Andean camelid bred for 5,000+ years as a pack animal and fibre source; descended from the guanaco, roughly seven million llamas support highland communities in Peru and Bolivia.
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Critically Endangered
Long-beaked Echidna
Long-beaked echidnas (genus Zaglossus) are egg-laying monotreme mammals of New Guinea highland forest; Attenborough's long-beaked echidna was not recorded for roughly sixty years until camera-trap images in 2023, and the genus is Critically Endangered.
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Not Evaluated
Lynx
The Eurasian lynx (Lynx lynx) is Europe's largest wild cat, listed as Least Concern by the IUCN; it inhabits boreal and temperate forests across Eurasia and has recovered in several western European countries after decades of persecution.
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Endangered
Malayan Tapir
A Malayan tapir is a large, plant-eating mammal native to the rainforests of Sumatra and Peninsular Malaysia. It is the biggest of the five tapir species and the only tapir found in Asia, recognisable by its black-and-white "saddle" coat and short, flexible snout.
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Not Evaluated
Manatee
Manatees are plant-eating sirenians with three species in the Americas and West Africa — slow-moving mammals threatened by boat collisions, habitat loss and pollution, with IUCN status from Vulnerable to Endangered.
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Near Threatened
Maned Wolf
A maned wolf is the tallest wild canid in the world, a long-legged, reddish-coated omnivore native to the grasslands of central South America — especially Brazil's Cerrado — that despite its name is neither a true wolf nor a fox but the only species in the genus Chrysocyon.
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Near Threatened
Markhor
A markhor (Capra falconeri) is a large wild goat native to the mountains of Central and South Asia, famous for the males' long, twisting corkscrew horns; it is Pakistan's national animal and is currently listed by the IUCN as Near Threatened.
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Least Concern
Marmoset
Marmosets are small New World monkeys in the family Callitrichidae of Central and South America; the pygmy marmoset (Cebuella) at about 100 g is the smallest monkey alive, and the group is heavily traded as pets despite complex social and dietary needs.
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Not Evaluated
Marmot
Marmots are large, burrowing ground squirrels of the genus Marmota found across mountain and steppe habitats in North America and Eurasia; most of the 15 species are Least Concern, though the Vancouver Island marmot is Critically Endangered and the Mongolian marmot is Endangered.
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Not Evaluated
Meerkat
A meerkat (Suricata suricatta) is a small, highly social mongoose native to the arid Kalahari and southern Africa. It lives in cooperative groups of up to about thirty, posts sentinels to watch for predators, and feeds mainly on insects, scorpions and other small prey.
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Least Concern
Mink
The American mink (Neogale vison) is a semi-aquatic mustelid listed Least Concern in native North America but invasive across Europe after fur-farm escapes, where it devastated water vole populations and displaced the Critically Endangered European mink.
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Not Evaluated
Mongoose
Mongooses are small carnivorans of family Herpestidae — roughly 34 species across Africa and Asia; the small Asian mongoose (Herpestes javanicus) is Least Concern and native from Pakistan to Indonesia, famous for hunting snakes.
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Not Evaluated
Monkey
Monkeys are tailed simian primates of the Americas, Africa and Asia — roughly 260+ species with forward-facing eyes, grasping hands and complex social groups. They are distinct from tailless apes; status ranges from Least Concern to Critically Endangered, and most species are protected from international trade.
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Vulnerable
Moon Bear
The moon bear (Ursus thibetanus), or Asiatic black bear, is a Vulnerable forest bear of South and East Asia recognised by a white chest V or crescent; it is the species overwhelmingly kept on bile farms in tiny cages for gallbladder extraction, though synthetic substitutes make farmed bile medically unnecessary.
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Not Evaluated
Moose
The moose (Alces alces) is the world's largest deer, standing up to 2.1 m (7 ft) at the shoulder and weighing up to 771 kg (1,700 lb), found across the boreal forests of North America, Northern Europe, and Russia.
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Least Concern
Muskox
The muskox (Ovibos moschatus) is an Arctic bovid with a shaggy coat, curved horns and defensive circle formation — recovered from near extinction and now Least Concern, but vulnerable to rapid Arctic climate change.
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Least Concern
Muskrat
The muskrat (Ondatra zibethicus) is a large semiaquatic rodent native to North American wetlands and listed Least Concern there; introduced to Europe from 1905 for fur farming, it burrows into dikes and river banks and is an EU-listed invasive species.
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Least Concern
Naked Mole-Rat
The naked mole-rat (Heterocephalus glaber) is a eusocial East African rodent that lives in insect-like colonies with a breeding queen, tolerates extreme hypoxia and carbon dioxide, shows negligible ageing, resists cancer, and lacks normal acid pain sensation.
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Not Evaluated
Narwhal
The narwhal (Monodon monoceros) is a Near Threatened Arctic whale whose males bear a long spiralled tusk — actually an enlarged tooth — with roughly 80,000 individuals dependent on sea ice and deep-water prey.
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Least Concern
Northern Elephant Seal
The northern elephant seal (Mirounga angustirostris) is a huge deep-diving seal of the eastern Pacific, breeding on beaches in California and Mexico and feeding far offshore. Bulls are enormous, reaching around 3.5 m long and weighing anywhere from 400 to 2,300 kg, far heavier than females.
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Near Threatened
Numbat
The numbat (Myrmecobius fasciatus) is a diurnal marsupial of south-western Australia that eats almost exclusively termites using a long sticky tongue; after falling to roughly 300 animals in the 1970s, recovery efforts have raised numbers to an estimated 2,000–3,000 and the IUCN downlisted it to Near Threatened in 2026.
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Least Concern
Nutria
The nutria or coypu (Myocastor coypus) is a large semiaquatic rodent Least Concern in native South America but listed among the world's worst invasive species after fur-farm escapes — it destroys wetlands, undermines banks and was eradicated from Britain by 1989.
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Not Evaluated
Ocelot
The ocelot (Leopardus pardalis) is a spotted wild cat of the Americas, listed as Least Concern by the IUCN but declining locally due to habitat loss and historical over-trapping; a small population persists in southern Texas.
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Endangered
Okapi
The okapi (Okapia johnstoni) is the giraffe's only living relative, a solitary rainforest herbivore found exclusively in the Democratic Republic of the Congo, with striped hindquarters for camouflage and a long dark prehensile tongue.
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Critically Endangered
Orangutan
Orangutans are Critically Endangered great apes found only in Borneo and Sumatra; all three species — Bornean, Sumatran, and Tapanuli — face extinction driven mainly by habitat loss from palm oil and logging, plus the illegal pet trade.
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Not Evaluated
Orca
The orca (Orcinus orca) is the world's largest oceanic dolphin — a black-and-white apex predator found in all oceans, with pod-specific diets and cultures; globally assessed as Data Deficient on the IUCN Red List.
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Not Evaluated
Otter
Otters are 13 species of aquatic mustelids worldwide — from the Endangered giant otter of South America to the recovering sea otter of the Pacific; status ranges from Least Concern to Endangered.
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Least Concern
Pallas's Cat
Pallas's cat (Otocolobus manul) is a small, densely furred wild cat of Central Asian steppe and semi-desert, with a flat round face, circular pupils and an ambush-hunting lifestyle focused on pikas and small rodents.
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Not Evaluated
Pangolin
Pangolins are the world's most heavily trafficked wild mammals; all eight species are threatened by illegal trade in their keratin scales, used in traditional medicine across Asia, with the Chinese and Sunda pangolins now Critically Endangered.
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Not Evaluated
Pika
Pikas (genus Ochotona) are small, round-eared alpine mammals related to rabbits that live on cold, rocky mountain slopes across Asia and western North America, where they are threatened by rising temperatures that their heat-sensitive bodies cannot tolerate.
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Not Evaluated
Pine Marten
A pine marten (Martes martes) is a cat-sized, tree-climbing member of the weasel family native to European and western Asian woodland. Chestnut-brown with a cream throat bib and bushy tail, it is rare in much of Britain but recovering, and is globally classed as Least Concern by the IUCN.
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Endangered
Pink River Dolphin
A pink river dolphin (Inia geoffrensis), also called the boto or Amazon river dolphin, is a freshwater toothed whale native to the Amazon and Orinoco river systems of South America. It is the largest river dolphin, named for the pink colouring adults often develop, and is classed as Endangered by the IUCN.
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Near Threatened
Platypus
A platypus is a semi-aquatic, egg-laying mammal (a monotreme) native to eastern Australia and Tasmania. It has a duck-like bill, webbed feet and a beaver-like tail, hunts underwater using electroreception, and males carry venomous ankle spurs. It is listed as Near Threatened on the IUCN Red List.
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Vulnerable
Polar Bear
The polar bear (Ursus maritimus) is listed as Vulnerable by the IUCN, with an estimated 22,000–31,000 individuals; climate change and the loss of Arctic sea ice are the primary threats to its survival.
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Not Evaluated
Porcupine
A porcupine is a large herbivorous rodent covered in sharp quills — stiffened, modified hairs that defend it from predators. About 30 species exist in two distantly related families: Old World porcupines of Africa, Asia and Europe, and tree-climbing New World porcupines of the Americas.
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Not Evaluated
Porpoise
Porpoises are a separate family from dolphins, with blunt beakless heads, triangular dorsal fins and spade-shaped teeth; the family includes the vaquita, the most endangered marine mammal in the world.
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Least Concern
Prairie Dog
Prairie dogs (genus Cynomys) are five species of social North American ground squirrel whose colony burrows keystone the Great Plains prairie — reduced to a fraction of historic range by poisoning, plague and habitat loss.
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Endangered
Proboscis Monkey
A proboscis monkey is a large, reddish-brown Old World monkey found only on the island of Borneo (in Indonesia, Malaysia and Brunei), famous for the male's oversized hanging nose and for living in coastal mangrove and riverside forests; the IUCN classes it as Endangered.
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Vulnerable
Quokka
The quokka is a Vulnerable marsupial found only in south-western Western Australia, best known for its photogenic "smile" but facing serious threats from feral predators, habitat loss, and climate change.
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Not Evaluated
Rabbit
Rabbits are small herbivorous mammals of the family Leporidae (over 70 species); most are common, but a few wild species such as the riverine and volcano rabbits are Critically Endangered or Endangered, and pet and farmed rabbits raise real welfare concerns.
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Not Evaluated
Raccoon
The raccoon (Procyon lotor) is a Least Concern omnivorous procyonid native to the Americas, famous for its eye mask, ringed tail and dexterous paws; it thrives in wild and urban habitats and has been introduced to Europe.
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Least Concern
Red Deer
The red deer (Cervus elaphus) is a large Eurasian cervid — stags with branched antlers, autumn rut, Least Concern globally — closely related to North American elk and widely introduced outside native range.
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Not Evaluated
Red Fox
The red fox (Vulpes vulpes) is the world's most widely distributed wild carnivore, living across the Northern Hemisphere; the IUCN lists it as Least Concern with a stable population.
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Endangered
Red Panda
The red panda (Ailurus fulgens) is an Endangered Himalayan forest mammal unrelated to giant pandas — a bamboo-eating specialist threatened by deforestation, poaching and road deaths across Nepal, India, Bhutan, China and Myanmar.
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Least Concern
Reindeer
Reindeer (Rangifer tarandus) are Arctic and subarctic deer in which both sexes grow antlers; the Eurasian name reindeer and the North American name caribou refer to the same species, with some Eurasian populations herded and most North American ones wild.
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Not Evaluated
Rhino
Rhinoceroses are five living species of horned megaherbivores in Africa and Asia; all are threatened by poaching for keratin horn, with three species Critically Endangered including the Sumatran rhino with fewer than 50 individuals.
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Least Concern
Roe Deer
The roe deer (Capreolus capreolus) is a small European deer with short antlers, delayed implantation after a summer rut, and solitary fawns hidden in vegetation — Least Concern and expanding across much of its range.
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Near Threatened
Saiga Antelope
The saiga antelope (Saiga tatarica) is a Central Asian steppe ungulate with a distinctive trunk-like nose, downlisted to Near Threatened in 2023 after recovery from Critically Endangered, with Kazakhstan holding around 1.9 million animals but remaining vulnerable to mass disease die-offs.
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Least Concern
Sand Cat
The sand cat (Felis margarita) is a small pale desert felid of the Sahara, Arabian Peninsula and Central Asia, adapted to extreme aridity with fur-covered footpads, large ears for heat dissipation and the ability to survive without drinking free water.
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Not Evaluated
Sea Lion
Sea lions are eared seals (family Otariidae) with visible ear flaps and land agility — about 16 species on Pacific and southern coasts whose IUCN status ranges from Least Concern to Endangered.
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Endangered
Sea Otter
The sea otter (Enhydra lutris) is an Endangered North Pacific keystone predator that maintains kelp forests by controlling sea urchins — insulated by the densest fur of any mammal, not blubber.
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Not Evaluated
Seal
Seals are earless marine mammals (family Phocidae) with about 19 species worldwide — expert divers of polar and temperate seas whose conservation status ranges from abundant to Endangered depending on species and region.
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Not Evaluated
Serval
The serval is a medium-sized African wild cat (Leptailurus serval) renowned for having the largest ears relative to body size of any cat species, a hunting success rate near 50 percent, and the longest legs relative to body size of any wild felid.
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Not Evaluated
Sheep
Sheep (Ovis aries) are flock livestock domesticated from wild mouflon — social prey animals needing companions; commercial wool and lamb systems impose tail docking, transport stress and predator culls.
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Not Evaluated
Shrew
A shrew is a small insect-eating mammal of the family Soricidae, with a long pointed snout, tiny eyes and velvety fur. Though mouse-like, shrews are not rodents but relatives of moles and hedgehogs, and are known for their extremely high metabolism and near-constant feeding.
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Endangered
Siamang
The siamang (Symphalangus syndactylus) is the largest gibbon, Endangered across Sumatra and the Malay Peninsula, known for paired morning duets amplified by an inflatable throat sac; oil palm, pulpwood and mining drive forest loss across its range.
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Critically Endangered
Sifaka
Sifakas are nine species of lemur in the genus Propithecus, found only in Madagascar, famous for sideways bipedal hopping on the ground; several species are Critically Endangered as an estimated 80–90% of the island's original forest has been lost to tavy, charcoal production and the pet trade.
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Not Evaluated
Skunk
The skunk (family Mephitidae) is a small-to-medium omnivorous mammal found throughout the Americas, best known for its powerful sulphur-compound defensive spray, which it can aim accurately at threats up to six metres away.
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Not Evaluated
Sloth
A sloth is a slow-moving, leaf-eating mammal that lives hanging upside down in the trees of Central and South American rainforests. There are six living species in two groups, the three-toed sloths (Bradypus) and two-toed sloths (Choloepus), and they are the slowest mammals on Earth.
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Vulnerable
Sloth Bear
The sloth bear (Melursus ursinus) is a Vulnerable myrmecophagous bear of India, Nepal, Sri Lanka and Bhutan — adapted for eating ants and termites with long claws and a tube-like muzzle, threatened by habitat loss and conflict.
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Not Evaluated
Slow Loris
Slow lorises are small nocturnal primates from South and Southeast Asia; every species is threatened with extinction — ranging from Vulnerable to Critically Endangered — largely because of the illegal pet trade, which is fuelled in part by viral social media videos.
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Vulnerable
Snow Leopard
A snow leopard (Panthera uncia) is a large wild cat native to the high mountains of Central and South Asia, recognised by its pale grey rosette-patterned coat and very long tail, and listed as Vulnerable on the IUCN Red List.
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Vulnerable
Spectacled Bear
The spectacled bear is South America's only bear species and the last surviving short-faced bear; the IUCN lists it as Vulnerable, threatened by deforestation, conflict with farmers, and the illegal wildlife trade.
-
Vulnerable
Spectral Tarsier
The spectral tarsier (Tarsius tarsier) is a tiny nocturnal primate of Sulawesi with eyes larger than its brain, head rotation of nearly 180 degrees, and ultrasonic vocalisations; it is listed Vulnerable as forest is lost across Wallacea.
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Not Evaluated
Sperm Whale
The sperm whale (Physeter macrocephalus) is a Vulnerable deep-diving toothed whale — the largest brain of any animal — hunting squid in abyssal depths after centuries of commercial whaling depletion.
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Least Concern
Spotted Cuscus
The spotted cuscus (Spilocuscus maculatus) is a nocturnal marsupial possum of New Guinea and northern Australia in which males are white with dark spots and females are plain grey or brown; it is listed Least Concern but is heavily hunted across accessible lowland forest.
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Not Evaluated
Squirrel
A squirrel is a small-to-medium rodent in the family Sciuridae, a group of more than 280 species worldwide that includes tree squirrels, ground squirrels and gliding flying squirrels; most are common and Least Concern, though some island species are endangered.
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Least Concern
Stoat
The stoat (Mustela erminea) is a small mustelid of Eurasia and North America that turns white in winter except for a black-tipped tail, hunts prey far larger than itself including rabbits, and was introduced to New Zealand where it is now a major invasive predator.
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Not Evaluated
Street Dog
An estimated 200 million street dogs live worldwide; they are the same species as pet dogs (Canis lupus familiaris), and WHO-endorsed Catch-Neuter-Vaccinate-Return programmes are the proven humane way to reduce their numbers and control rabies, whereas culling does not work.
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Least Concern
Sugar Glider
The sugar glider (Petaurus breviceps) is a small nocturnal marsupial of Australia and New Guinea that glides on a skin membrane between trees — Least Concern in the wild but widely kept as an exotic pet with frequent welfare failures.
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Critically Endangered
Sumatran Rhino
A Sumatran rhino is the smallest, hairiest living rhinoceros — a two-horned, rainforest-dwelling species of Indonesia and the only surviving member of the genus Dicerorhinus, now Critically Endangered with fewer than roughly 50 individuals left.
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Vulnerable
Sun Bear
Sun bears are the world's smallest bears, native to Southeast Asia, and are listed as Vulnerable by the IUCN; they are threatened by deforestation, the pet trade, and the bear bile industry, in which bears are caged for years and milked for bile used in traditional medicine.
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Vulnerable
Sunda Clouded Leopard
The Sunda clouded leopard (Neofelis diardi) is a Vulnerable tree-dwelling cat of Borneo and Sumatra, a separate species since 2006, with the longest canines relative to skull among living cats; oil palm, pulpwood, mining and snaring drive losses.
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Not Evaluated
Tapir
Tapirs are four threatened species of forest herbivore in Asia and the Americas — all Endangered or Vulnerable — serving as seed dispersers; WARN covers the Malayan tapir in detail.
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Not Evaluated
Tarsier
Tarsiers are tiny nocturnal primates of South-east Asian islands, with the largest eyes relative to body size of any mammal; most species are Vulnerable to Endangered due to habitat loss and the pet trade.
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Endangered
Tasmanian Devil
The Tasmanian devil (Sarcophilus harrisii) is an Endangered carnivorous marsupial found only in Tasmania, Australia, whose wild population has plummeted by around 80% since the 1990s due to a transmissible facial cancer called Devil Facial Tumour Disease (DFTD).
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Least Concern
Tenrec
Tenrecs are around 30 species of mammal in the family Tenrecidae, an adaptive radiation endemic to Madagascar; the lowland streaked tenrec is the only mammal known to stridulate with quills, and the family persists as an estimated 80–90% of Madagascar's original forest has been lost.
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Endangered
Tiger
A tiger (Panthera tigris) is the largest living cat species, a striped, solitary carnivore native to Asia; the Sumatran tiger of Indonesia and the Malayan tiger of Malaysia are two of the most endangered surviving populations, both listed as Critically Endangered.
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Endangered
Tree Kangaroo
Tree kangaroos are around 14 species of marsupial in the genus Dendrolagus that live in the rainforest canopies of New Guinea and far north Queensland; they descend from ground-dwelling kangaroos that returned to the trees, and several species are Endangered or Critically Endangered.
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Not Evaluated
Uakari
The bald uakari (Cacajao calvus) is a short-tailed, crimson-faced primate found exclusively in the seasonally flooded forests of the western Amazon; its fiery red face signals health to potential mates and makes it one of the most distinctive monkeys in South America.
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Vulnerable
Urial
The urial (Ovis vignei) is a Vulnerable wild sheep of Central and South Asia, with around 30,000 individuals remaining and populations declining across most of its range due to poaching, habitat loss, and livestock competition.
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Critically Endangered
Vaquita
The vaquita (Phocoena sinus) is the world's rarest marine mammal, a small porpoise found only in Mexico's Gulf of California, with fewer than ten individuals remaining as of 2025 due to drowning in illegal gillnets.
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Not Evaluated
Virginia Opossum
An opossum (Didelphis virginiana, the Virginia opossum) is North America's only native marsupial — a cat-sized, pouched mammal with a pointed snout, grasping prehensile tail and grey-white fur. It is famous for "playing dead", eating ticks and pests, and resisting many snake venoms.
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Not Evaluated
Wallaby
Wallabies are small-to-medium marsupials native to Australia and New Guinea, closely related to kangaroos, with more than 30 species ranging from common and widespread to Near Threatened, Vulnerable or Endangered depending on the species.
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Vulnerable
Walrus
A walrus (Odobenus rosmarus) is a huge Arctic pinniped, or fin-footed marine mammal, famous for its long ivory tusks and bristly whiskered snout. It hauls out on sea ice and dives to the seabed to feed on clams, using sensitive whiskers to find shellfish in dark water.
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Not Evaluated
Warthog
The common warthog (Phacochoerus africanus) is a grazing wild pig of African savanna, listed as Least Concern; recognisable by facial warts and tusks, it kneels to graze and shelters in burrows when threatened.
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Not Evaluated
Water Vole
A water vole (Arvicola amphibius) is a large, semi-aquatic rodent found along rivers, ditches and reed beds across Europe and western Asia. With chestnut fur, a blunt muzzle and a furry tail, it is a true vole — not a rat — and the inspiration for "Ratty" in The Wind in the Willows.
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Not Evaluated
Weasel
A weasel (Mustela nivalis), or least weasel, is the world's smallest carnivorous mammal: a slim, agile, short-legged hunter with a brown back and pale belly. Found across Europe, Asia and North America, it preys mainly on mice and voles, chasing them into their own burrows.
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Not Evaluated
Whale
Whales are cetacean mammals (~90 species) including baleen and toothed forms — from the blue whale to sperm whales and orcas; status ranges from recovering humpbacks to Critically Endangered vaquita and North Atlantic right whale.
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Not Evaluated
Wild Boar
The wild boar (Sus scrofa) is a Least Concern suid native across Europe, Asia and North Africa — ancestor of the domestic pig, widespread from Pakistan to Indonesia and increasing across Europe.
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Not Evaluated
Wildebeest
The blue wildebeest (Connochaetes taurinus) is a gregarious grazing antelope of African savanna, central to the Great Migration of over a million animals between Serengeti and Maasai Mara; listed as Least Concern but declining outside protected areas.
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Not Evaluated
Wolf
The grey wolf (Canis lupus) is a Least Concern pack-hunting canid of the Northern Hemisphere and wild ancestor of dogs — regionally extirpated in much of Europe and North America but recovering where reintroduced.
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Not Evaluated
Wolverine
The wolverine (Gulo gulo) is a large, powerful member of the weasel family found across boreal and Arctic regions of North America and Eurasia, classified as Least Concern globally by the IUCN but facing serious pressure from climate-driven snowpack loss, trapping, and habitat fragmentation.
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Not Evaluated
Wombat
Wombats are stocky Australian marsupials in the family Vombatidae; the common wombat is Least Concern on the IUCN Red List, while the northern hairy-nosed wombat is Critically Endangered with fewer than 400 individuals surviving in Queensland.
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Not Evaluated
Working Donkey
A working donkey is a domesticated donkey (Equus africanus asinus) used to carry loads, pull carts, or turn mills; it descends from the Critically Endangered African wild ass, and while the species itself is not threatened, individual working donkeys in regions such as Pakistan commonly suffer from overloading, ill-fitting harnesses, and limited veterinary access.
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Not Evaluated
Xerus (African Ground Squirrel)
Xerus are African ground squirrels — small, sociable, burrowing rodents found across sub-Saharan Africa that are famous for using their bushy tails as portable parasols to stay cool in scorching heat; all four species are currently Least Concern on the IUCN Red List.
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Vulnerable
Yak
The wild yak (Bos mutus) is a Vulnerable high-altitude bovid of the Tibetan Plateau and Himalayas — ancestor of the domestic yak, threatened by hunting, hybridisation and habitat disturbance; remnant populations persist in Pakistan and Nepal.
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Not Evaluated
Zebra
A zebra is a striped African member of the horse genus Equus; there are three species — plains, mountain, and Grevy's — ranging from Near Threatened to the Endangered Grevy's zebra, of which fewer than about 2,000 mature animals survive.