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Your animal library

Animals A to Z

Discover 491 free animal guides, from Aardvark to Zebra. Find a familiar favourite or meet something new.

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Search a name or explore by letter, animal group, region and conservation status.

Don't know the name? Start with its features

Common names, scientific names and places are searchable.

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Showing 1–24 of 491 guides

Animal group
A wild aardvark (Orycteropus afer) foraging at dusk among dry scrub in open savanna, its long ears, tubular snout and arched back clearly visible.
Least Concern

Mammals

A

Aardvark

Orycteropus afer (Pallas, 1766)

Africa's solitary digger — one species, an entire order, built for termites.

Sub-Saharan Africa

Open guide
A coiled adder (Vipera berus) basking on heathland, its grey-brown body marked with the species' distinctive dark zigzag stripe running down the back and a V-shaped marking on the head.
Least Concern

Reptiles

A

Adder

Vipera berus

Britain's only venomous snake — a shy, cold-tolerant viper marked by an unmistakable zigzag.

United Kingdom · Scandinavia and northern Europe

Open guide
Smooth olive-gray African clawed frog floating in water with limbs splayed out
Least Concern

Amphibians

A

African Clawed Frog

Xenopus laevis

The fully aquatic lab and pet frog

Africa

Open guide
African wild dog with mottled coat in savanna
Endangered

Mammals

A

African Wild Dog

Lycaon pictus

Africa's cooperative pack hunter

Africa

Open guide
A wandering albatross gliding low over the open ocean on long, narrow outstretched wings, with a pale body, dark wingtips and a large pinkish bill.
Varies; most albatross species are threatened

Birds

A

Albatross

Diomedeidae

The ocean's greatest gliders — and the world's most threatened bird family.

Southern Ocean · North Pacific

Open guide
An American alligator resting at the water's edge with its armoured snout and eyes visible above the surface.
Varies by species

Reptiles

A

Alligator

Alligator mississippiensis (Daudin, 1802) and Alligator sinensis (Fauvel, 1879)

Armoured survivors of ancient wetlands — powerful, patient and ecologically vital.

United States · China

Open guide
A domestic alpaca with dense fleece and upright ears standing in a high-altitude Andean pasture against a mountain backdrop.
Domesticated

Mammals

A

Alpaca

Vicugna pacos (Linnaeus, 1758)

The Andes' woolly camelid — domesticated for millennia, prized for its fleece.

Peru · Bolivia

Open guide
An American bison grazing on open prairie grassland, its massive dark-brown hump and thick woolly coat clearly visible as it lowers its head to feed on green grass and sagebrush
Near Threatened

Mammals

A

American Bison

Bison bison

Once numbering 60 million, the mighty American bison now depends on careful management to survive — a cautionary tale and a conservation triumph.

North America · United States

Open guide
Large green American bullfrog sitting at the edge of a pond among reeds
Least Concern

Amphibians

A

American Bullfrog

Lithobates catesbeianus

North America's largest and loudest frog

North America

Open guide
A silver freshwater angelfish with tall fins and dark vertical bars swimming among green aquarium plants.
Domesticated aquarium fish; wild type widespread in the Amazon basin

Fish

A

Angelfish

Pterophyllum scalare (Lichtenstein, 1823) — freshwater angelfish, family Cichlidae

Tall, graceful Amazon cichlids — community-tank icons bred into many colour and fin varieties.

South America — Amazon basin (wild type); aquariums worldwide

Open guide
Dark deep-sea anglerfish with a glowing lure and large toothy mouth
Least Concern

Fish

A

Anglerfish

Lophiiformes

The deep-sea hunter with a glowing lure

Oceans

Open guide
Lowland anoa, a small dark buffalo with short horns, standing in Sulawesi rainforest understorey
Endangered

Mammals

A

Anoa

Bubalus depressicornis and B. quarlesi — dwarf buffalo of Sulawesi

The smallest wild cattle on Earth — endemic to Sulawesi and declining in both forest types.

Sulawesi, Indonesia · Endemic — lowland and mountain forests

Open guide
Close-up of a black ant standing on soil
Least Concern

Invertebrates

A

Ant

Formicidae

The tireless team-working insect

Africa · Asia

Open guide
Mixed herd of African antelope species — impala, wildebeest and gazelle — grazing together on golden savanna plains at sunrise.
Varies by species

Mammals

A

Antelope

Family Bovidae, subfamilies Antilopinae, Alcelaphinae, Hippotraginae and others — ~90 species

The hoofed heart of the savanna — ninety species, one extraordinary family.

Africa · Asia

Open guide
Arabian oryx with long straight white horns and pale coat standing on sandy desert plain under harsh midday sun
Vulnerable

Mammals

A

Arabian Oryx

Oryx leucoryx (Pallas, 1777) — family Bovidae

The antelope that went extinct in the wild and came back — a case study in what captive breeding can achieve.

Arabian Peninsula — desert and gravel plains of Oman, Saudi Arabia, UAE and Jordan

Open guide
Banded archerfish with silver flank bands swimming just below the surface in a mangrove estuary
Least Concern

Fish

A

Archerfish

Toxotes jaculatrix (Pallas, 1767) — family Toxotidae

A fish that shoots insects off leaves with a jet of water — and corrects for refraction.

Indo-Pacific mangroves and estuaries · From India to northern Australia and Melanesia

Open guide
Arctic fox in thick white winter coat on tundra snow
Least Concern globally; the Scandinavian population remains critically small

Mammals

A

Arctic Fox

Vulpes lagopus (Linnaeus, 1758) — family Canidae

The warmest coat of any mammal, a coat that changes colour, and a species being pushed north by its bigger cousin.

Arctic tundra of Eurasia, North America, Greenland, Iceland and Svalbard · Sea ice in winter

Open guide
A nine-banded armadillo foraging on leaf-littered ground, showing its leathery banded bony shell, long pointed snout, sturdy digging claws and tapering armoured tail.
Varies; nine-banded armadillo Least Concern

Mammals

A

Armadillo

Dasypus novemcinctus and relatives (order Cingulata)

The Americas' armour-plated insect hunters

Central America · South America

Open guide
Large Asian giant hornet with orange head and striped body on a wooden surface
Least Concern

Invertebrates

A

Asian Giant Hornet

Vespa mandarinia

The world's largest hornet

Asia

Open guide
Assassin bug with curved rostrum and slender body on a leaf, forelegs adapted for grasping prey
Not Evaluated as a family

Invertebrates

A

Assassin Bug

Family Reduviidae — over 7,000 described species worldwide

A predatory bug that stabs prey with a needle rostrum — and some species wear their victims as camouflage.

Worldwide in temperate and tropical regions · Gardens, woodland and scrub

Open guide
Atlantic cod with barbel on chin over sandy seabed
Vulnerable

Fish

A

Atlantic Cod

Gadus morhua

The fish that built Atlantic nations

Europe · North America

Open guide
Atlantic horseshoe crab with a domed shell and long pointed tail on a sandy beach
Vulnerable

Invertebrates

A

Atlantic Horseshoe Crab

Limulus polyphemus

The ancient living fossil with blue blood

Oceans · North America

Open guide
An Atlantic puffin standing on a grassy clifftop, showing its black-and-white plumage, orange legs and large triangular bill striped in red, orange-yellow and slate grey, with several silver sand eels held crosswise in its beak.
Vulnerable

Birds

A

Atlantic Puffin

Fratercula arctica

The North Atlantic's beloved "sea parrot" — a burrow-nesting seabird whose famous bill fades each winter at sea.

Iceland · Norway and the Faroe Islands

Open guide
Atlas moth with vast patterned wings and snake-head wingtips resting on tropical vegetation
Not Evaluated

Invertebrates

A

Atlas Moth

Attacus atlas (Linnaeus, 1758) — family Saturniidae

One of the largest moths on Earth — no mouthparts, living on larval fat for a week or two as an adult.

Southeast Asia · Borneo, Sumatra, Malay Peninsula and tropical Asia

Open guide

About this animal library

WARN’s animals A to Z brings together 491 guides to species, animal groups and selected domestic breeds. Search by common or scientific name, or explore by letter, animal group, region and conservation status.

491

Free animal guides

26

Letters to explore

22

Guides labelled Critically Endangered

110

Guides with a threatened status

Counts describe this library. Entries may cover a species, a group or a domestic breed. Conservation labels reflect the assessments cited in each guide.

By WARN Research & Conservation TeamLast updated

Find the animal you are curious about

Start with a name, a letter or a question. You can combine filters and share the resulting link.

  1. 01

    Search a name or choose a letter

    Try a common name such as orangutan or a scientific name such as Pongo. Letter pages collect animal names beginning with each letter of the English alphabet.

  2. 02

    Narrow your discoveries

    Choose an animal group, region or conservation status. Filter counts change as you narrow the list. Clear a filter to broaden your results again.

  3. 03

    Read the guide and its sources

    Open a card for identification, habitat, diet, behaviour and conservation information. Check whether it describes a single species or a wider group, and follow the references for the evidence behind a fact.

Common names, scientific names and animal groups

A common name is the everyday name of an animal. A scientific name helps identify the species more precisely. Some familiar names, such as bear or parrot, describe several species.

Common names vary between languages and places. A name can also refer to different animals in different contexts. When you compare facts, check the scientific name and the location as well as the heading. Search accepts both common and scientific names so you can begin with whichever you know.

A broad group guide gives an overview and introduces its members. A species guide can be more specific about range, diet and conservation. Domestic breeds are another kind of entry: a breed is not a separate wild species. These entries each count as one guide in this library.

For closely related or easily confused animals, explore compare. A side-by-side comparison is useful when you want to understand identification features rather than read two separate overviews.

How to read animal facts in context

Size, lifespan, diet and behaviour need context. Check whether a figure describes an adult or a juvenile, a typical range or an exceptional record, and animals in the wild or in human care.

A maximum weight does not describe every individual. Males and females may differ, and measured populations may live in different conditions. When a guide gives a range, read the explanation alongside it before using a single number in schoolwork or a comparison.

Diet describes what an animal eats, while habitat describes where it lives. Behaviour can change with season, age, breeding and food availability. Details from one species should not automatically be applied to every animal in its group.

Looking for a particular term? baby animal names explains names for young animals, and animal group names covers collective nouns. answers offers focused explanations of common animal questions.

Explore animals by habitat and region

An animal’s range is the area where it occurs; its habitat is the environment it uses within that area. The region filter offers a starting point, while individual guides explain the detail.

A broad label such as Asia does not mean an animal lives throughout the continent. Island populations, migration routes and small remaining ranges can be especially important. Read the guide’s distribution section to understand where the animal is found.

Forest, wetland, grassland and ocean habitats support different communities of animals. Some species use more than one habitat during their lives. Habitat loss, fragmentation and changes in food or water can affect them differently.

Use wildlife guides to explore themed collections, including animals in asia and animals in south america. Those collections offer another way to discover the same guide library.

What do conservation status labels mean?

The IUCN Red List assesses extinction risk. Vulnerable, Endangered and Critically Endangered are the three threatened categories. They describe risk, rather than the number of animals a rescue organisation is caring for.

In this library, 22 guides carry a Critically Endangered label and 110 carry one of the three threatened labels. These are guide counts, not a count of all threatened species worldwide. A group covering several species may need a mixed-status explanation.

A global assessment and a local population can tell different stories. Read the named assessment and its date in the species guide. Data Deficient means there is insufficient information for a full assessment; Not Evaluated means the species has not been assessed against the criteria. Neither label establishes that an animal is safe.

CITES addresses international wildlife trade. Its listings have a different purpose from IUCN extinction-risk categories. See critically endangered animals for a focused collection, and animals threatened by wildlife trafficking for the trade context.

Check the evidence behind an animal guide

Use the references on the individual guide to trace a claim to its source. The date on this index reflects updates to the library; it does not mean every species assessment was published on that date.

Conservation assessments, scientific research and specialist animal organisations answer different questions. IUCN provides extinction-risk assessments, CITES provides trade information, and the references on a guide support its other factual claims. A source should support the particular statement being made.

For school projects or further research, record the species name, source and publication or assessment date. If sources differ, check whether they describe different populations, periods or methods before treating one figure as definitive.

Our sourcing and correction approach is explained at editorial standards. If you spot an error or an outdated reference, use contact and include the page link and the information that needs checking.

Turn curiosity into help for animals

Learning, sharing reliable information and supporting a relevant appeal are all ways to help. An animal’s inclusion in this library is educational; it does not establish that WARN has a rescue project for that animal.

Share a guide when it can correct a misconception or help someone understand a conservation issue. Choose responsible wildlife experiences, and avoid activities that depend on handling wild animals or purchasing wildlife products.

If you would like to donate, read appeals for the purpose and terms of each fund, and where your money goes for how funding decisions are explained. The Kalimantan appeal at kalimantan wildlife fires appeal sets out its evidence and the process for selecting recipients.

For an injured animal, use rescue to find appropriate next steps. For local pet adoption or nearby organisations, explore shelter directory.

Keep learning

Explore animal biology, remarkable adaptations and conservation in our focused explainers.

Browse all answers
Blue whale — largest animal on Earth, surfacing to breathe

Wildlife

What is the largest animal on Earth?

The blue whale (Balaenoptera musculus) is the largest animal ever known — reaching about 30 metres and 180 tonnes. It is a marine mammal, not a fish. The blue whale (Balaenoptera musculus) is the largest animal known to have lived — larger than any sauropod dinosaur.

Cheetah sprint — fastest land animal at roughly 110 km/h

Wildlife

What is the fastest land animal?

The cheetah (Acinonyx jubatus) is the fastest land animal — reaching roughly 110 km/h (68 mph) in short bursts over flat ground. It accelerates faster than most sports cars but tires quickly. Cheetahs (Acinonyx jubatus) hold verified top land speed — short bursts near 110 km/h on flat ground.

African elephant — largest land mammal

Wildlife

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. Mammals (class Mammalia) are vertebrates with hair or fur, three middle-ear bones, and females that produce milk to nurse young.

Bat in flight — mammals with powered flight, not birds

Wildlife

Are bats mammals?

Yes. Bats are mammals — the only mammals capable of true powered flight. They nurse pups with milk and are warm-blooded. With more than 1,400 species, bats (order Chiroptera) are the second-largest mammal group after rodents. They nurse pups with milk and are endothermic.

Bottlenose dolphin surfacing to breathe through its blowhole

Wildlife

Are dolphins fish or mammals?

Dolphins are mammals. They breathe air through a blowhole, nurse their young with milk, and are warm-blooded — despite living in the sea. Dolphins belong to the order Cetacea alongside whales and porpoises. Like all mammals, they have lungs, mammary glands and hair follicles at birth — even though adults appear hairless and fish-like in shape.

Green sea turtle swimming over a coral reef

Wildlife

What is the difference between a turtle and a tortoise?

Tortoises live on land with sturdy, unwebbed feet and high-domed shells. Turtles live in water and have webbed feet or flippers and more streamlined shells. Taxonomically, tortoises belong to the order Testudines — the turtle order — but “turtle” in everyday speech usually means aquatic or semi-aquatic species while “tortoise” means land specialists in the family Testudinidae.

American alligator with broad U-shaped snout in freshwater wetland

Wildlife

What is the difference between an alligator and a crocodile?

Alligators have broad, U-shaped snouts and only upper teeth visible when the mouth is closed; crocodiles have narrower V-shaped snouts and a fourth tooth on each side of the lower jaw that shows when closed. Crocodiles tolerate salt water; alligators are mainly freshwater.

Rhinoceros — IUCN Red List tracks extinction risk for thousands of species

Conservation

What is the IUCN Red List?

The IUCN Red List is the global standard for assessing extinction risk. Expert groups assign each species a category from Least Concern to Extinct based on population size, decline rate and range. The International Union for Conservation of Nature Red List of Threatened Species is the authoritative inventory of extinction risk for plants, fungi and animals worldwide.

Your questions answered

Animals A to Z: common questions

How many animals are in the A to Z index?
The index contains 491 published guides across 26 letters. Entries include individual species, wider animal groups and selected domestic breeds, so this is a guide count rather than a species count.
Is this a complete list of every animal in the world?
This is a growing collection of WARN guides. Many animals do not yet have an entry. You can suggest a missing animal through contact.
How do I find animals beginning with a particular letter?
Choose a letter to filter the search results, or open one of the letter pages below the browser for a list with links to each guide. For example, animals that start with A lists names beginning with A.
Can I search for an animal by its scientific name?
Yes. The search includes common and scientific names. You can also combine a search with animal-group, region and conservation-status filters.
How can I find endangered animals?
Choose Endangered or Critically Endangered in the conservation-status filter. Vulnerable is also a threatened category. For a collection with context, explore most endangered animals.
Are animal guides free to read?
Yes. The animal guides are free to read. Donations are optional; appeal pages explain their purpose, terms and funding arrangements.
Are there animal guides in German, French and Spanish?
Selected animal guides are available at tiere, animaux and animales. Their A–Z directories also link to the larger English library, with the language of those guides identified.
Does WARN rescue every animal in the index?
The library is educational and covers many animals beyond the scope of individual appeals. Read the relevant appeal for confirmed activities, funding plans and recipient information.

Sources and further reading

An optional next step

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