Wildlife Guide · Mexico

Axolotl

Q: How can I help save the axolotl?

The most effective way to help the axolotl is to fund the frontline rescue and habitat protection that keeps the species alive — WARN channels donations to partner-led teams working where the need is greatest. You can also ease the pressures behind its decline by avoiding the wildlife trade and souvenirs, never buying wild animals as pets, and choosing sustainable products, and by sharing accurate information to build wider support. See the ways to help below, or support WARN's Support Habitat Protection.

Q: Are axolotls endangered?

Yes. The IUCN lists the axolotl as Critically Endangered in the wild, where it survives only in the Xochimilco canal system near Mexico City. Estimates suggest just a few hundred or fewer remain, and some surveys find almost none. This is despite the species being extremely common in captivity, where hundreds of thousands live in labs, classrooms and home aquariums.

Q: Can axolotls really regrow their limbs?

Yes. Axolotls can regenerate entire amputated limbs, complete with bone, muscle, nerves and skin, usually within weeks. They can also repair the heart, spinal cord, retina and even parts of the brain without scarring. After injury, cells gather into a structure called a blastema that rebuilds the missing tissue. This rare ability makes the axolotl a key animal in regenerative medicine research.

Q: Why do axolotls stay babies their whole lives?

Axolotls show neoteny, meaning they keep larval features and stay aquatic for life instead of metamorphosing into land-dwelling adults like most salamanders. This happens because their bodies produce very little thyroid hormone, the signal that normally triggers metamorphosis. They keep their feathery external gills and tail fin yet still become sexually mature and breed in this larval-looking form.

Q: Where do axolotls live in the wild?

Axolotls are native only to the canal and wetland system of Xochimilco on the southern edge of Mexico City, and historically to the now largely drained Lake Chalco. This single, shrinking habitat is the reason the species is so vulnerable: as Mexico City has expanded, the wetlands have been polluted, drained and invaded by non-native fish, leaving very little suitable habitat.

Q: What do axolotls eat?

Axolotls are carnivores. In the wild they eat small prey such as worms, insects, insect larvae, small crustaceans, molluscs and tiny fish, sucking them in with a rapid gulp. In captivity they are commonly fed earthworms, bloodworms and specially formulated pellets. Their permanently larval anatomy means they hunt entirely underwater, detecting prey by movement and smell.

Q: What is the difference between an axolotl and a salamander?

An axolotl is a salamander, specifically a species in the mole salamander family. The key difference is that most salamanders metamorphose into terrestrial adults, losing their gills and living partly on land. The axolotl does not: through neoteny it keeps its gills, tail fin and aquatic lifestyle for life. Its close relative, the tiger salamander, does undergo full metamorphosis.

Q: Are axolotls dangerous?

Axolotls are not dangerous to people. They are small aquatic salamanders native to the Xochimilco canal system near Mexico City. Critically Endangered in the wild — with fewer than a thousand adults possibly remaining — they are abundant in laboratories and home aquariums, famous for regenerating limbs, parts of the heart, spinal cord and even portions of the brain.

Q: How long do axolotls live?

Axolotls typically live around 10–15 years according to this guide's quickFacts and stats. They remain aquatic and larval-looking for life through neoteny, keeping feathery external gills and breeding while still in that form. Wild survival is severely threatened despite their popularity in captivity.

Q: How big is an axolotl?

Axolotls are typically about 23 cm long, with a range of roughly 15–45 cm according to this guide's quickFacts. They are neotenic salamanders that never fully metamorphose, staying aquatic with external gills. The species is listed on CITES Appendix II and Critically Endangered in the wild.

Ambystoma mexicanum

The eternal baby salamander that regrows its own limbs

Critically Endangered (IUCN, 2020) in the wild

A pale pink axolotl with feathery external gills and a wide, smiling-looking mouth resting on the bed of a planted aquarium

Image: Source: Global Animal Guide (WARN) — verify license before production

In brief

An axolotl (Ambystoma mexicanum) is a neotenic salamander from the Xochimilco canals near Mexico City that stays aquatic and larval-looking for life, keeping external gills. Famous for regenerating limbs, organs and brain tissue, it is Critically Endangered in the wild yet common in captivity.

By the WARN Research & Conservation TeamChecked against IUCN Red List & CITES sourcesLast updated June 2026

The axolotl (Ambystoma mexicanum) is a neotenic salamander native only to the canal system of Xochimilco, near Mexico City. Unlike most amphibians, it never fully metamorphoses: it keeps its feathery external gills, stays aquatic for life and breeds while still in a larval-looking form. It is world-famous for an extraordinary ability to regenerate amputated limbs, parts of its heart, spinal cord and even portions of its brain. The axolotl is also a striking conservation paradox. It is one of the most abundant amphibians on Earth in laboratories, classrooms and home aquariums, yet it is Critically Endangered in the wild, where only a few hundred or fewer may survive.

~32B

genome base pairs

<1k

wild adults remaining

23 cm

typical adult length

10-15

years lifespan

Figures sourced from Axolotl - Wikipedia, IUCN Red List: Ambystoma mexicanum, CITES Appendix II listing and other references on this page.

Axolotl: Quick Facts

Vital statistics and key facts about the Axolotl
Scientific name	Ambystoma mexicanum
Common name	Axolotl (Mexican walking fish, though it is not a fish)
Size	Typically ~23 cm; range about 15-45 cm
Lifespan	Around 10-15 years
Diet	Carnivore: worms, insects, crustaceans, molluscs, small fish
Habitat	Freshwater canals and wetlands
Range	Xochimilco, Mexico City (historically also Lake Chalco)
Reproduction	Egg-laying; females can lay hundreds of eggs per clutch
Notable trait	Neoteny; regenerates limbs, organs and brain tissue
CITES	Appendix II

Scientific Classification

Scientific classification of the Axolotl
Kingdom	Animalia
Phylum	Chordata
Class	Amphibia
Order	Urodela (Caudata)
Family	Ambystomatidae
Genus	Ambystoma
Species	Ambystoma mexicanum

Conservation Status

IUCN Status: Critically Endangered in the wild (IUCN Red List). Abundant in captivity, but its only natural population, in the Xochimilco canals near Mexico City, has collapsed to perhaps a few hundred or fewer individuals, with some surveys finding almost none.
Population: Fewer than ~1,000 mature individuals in the wild (estimates vary; some surveys find very few)
Trend: Decreasing
Assessed: 2020
CITES: Appendix II

Threatened by urbanisation, water pollution, drainage of wetlands and invasive fish such as tilapia and carp. Conservation focuses on water-quality improvement, invasive-fish-free refuges and traditional chinampa farming in Xochimilco.

Did you know?

Despite being one of the most familiar amphibians on the planet in aquariums and labs, the wild axolotl is so rare that some recent surveys of its only native habitat have struggled to find a single one.

Key Facts: Axolotl

The axolotl is a salamander that stays aquatic and larval-looking for life, a trait called neoteny.
It is native only to the Xochimilco canal system near Mexico City, historically also Lake Chalco.
It can regenerate limbs, parts of the heart, spinal cord and even brain tissue, making it a key research animal.
It is Critically Endangered in the wild yet abundant in captivity, a stark conservation paradox.
Its main threats are urbanisation, water pollution and invasive fish such as tilapia and carp.
It is listed on CITES Appendix II, regulating international trade.

What makes the axolotl unique

The axolotl's defining feature is neoteny: it reaches sexual maturity and reproduces while retaining the body of a larva. Where most salamanders absorb their gills, climb onto land and breathe air as adults, the axolotl keeps its three pairs of feathery external gills, its broad tail fin and its fully aquatic lifestyle throughout its roughly 10-to-15-year life. Most individuals stop developing because their bodies produce very little thyroid hormone, the chemical signal that normally triggers metamorphosis. Wild axolotls are usually dark and mottled, providing camouflage among canal sediment and plants. The pale pink and white animals familiar from aquariums and photographs are largely the result of captive breeding for leucistic and albino colour forms, which are rare or absent in the wild. Adults most commonly measure around 23 cm long, though sizes from roughly 15 to 45 cm are recorded. Their permanently upturned mouths give them a distinctive smiling appearance that has made them a global internet and pop-culture icon.

Regeneration and scientific importance

The axolotl is one of the most studied animals in regenerative biology. It can regrow entire amputated limbs, complete with bone, muscle, nerves and skin, in a matter of weeks, and it can repair its heart, spinal cord, retina and parts of its brain rather than forming scar tissue. After injury, cells near the wound form a structure called a blastema, which rebuilds the missing part in the correct shape and orientation. Researchers study this process to understand why mammals, including humans, cannot regenerate in the same way. The axolotl has also become important in developmental biology, cancer resistance research and tissue-engineering studies. Its genome is enormous, around 32 billion base pairs, roughly ten times the size of the human genome and one of the largest animal genomes ever sequenced. Because the species breeds readily in captivity and tolerates laboratory conditions well, hundreds of thousands of axolotls now live in research facilities and homes worldwide, descended largely from a small number of founder animals.

The wild axolotl in peril

The contrast between the captive and wild axolotl is dramatic. In its only natural home, the canals and wetlands of Xochimilco on the southern edge of Mexico City, the species has collapsed. Surveys over recent decades have recorded sharp declines, and some find almost no animals at all; estimates suggest only a few hundred or fewer remain in the wild, leading the IUCN to list it as Critically Endangered. The causes are tied to the growth of one of the world's largest urban areas. Wetlands have been drained and built over, and remaining waterways suffer from sewage, agricultural run-off and pollution. Invasive fish introduced for food and the aquarium trade, particularly tilapia and carp, eat axolotl eggs and young and compete for food. Restoration efforts in Xochimilco focus on improving water quality, creating refuges free of invasive fish and working with local chinampa farmers who maintain the area's traditional floating gardens, on which the canals depend.

Axolotl vs typical salamander

Feature	Axolotl	Typical salamander (e.g. tiger salamander)
Adult form	Stays larval and aquatic (neoteny)	Metamorphoses into land-dwelling adult
Gills	Keeps external feathery gills for life	Loses gills, breathes with lungs/skin
Habitat as adult	Fully aquatic	Often terrestrial or semi-aquatic
Regeneration	Exceptional: limbs, heart, spinal cord, brain	Limited
Conservation	Critically Endangered in the wild	Varies; many species Least Concern

What WARN Does

WARN does not currently run a dedicated field project for the axolotl, which lives only in a small area of central Mexico, outside the countries where WARN's partners work partner countries. This guide is part of WARN's free educational and awareness work, helping people understand a species whose wild survival hangs in the balance. The same pressures that threaten the axolotl, habitat loss, water pollution and invasive species, also harm the wetland and freshwater animals WARN does protect elsewhere.

If you value clear, science-based wildlife guides like this one, a small gift helps fund WARN's habitat and freshwater conservation work for animals facing the very same threats.

Support Habitat Protection Donate to WARN

How can I help save the axolotl?

There are three practical things that make a real difference for the axolotl — and the first is the one that funds everything else.

Fund frontline rescue

Back the partner-led teams, veterinary care and protection that reach axolotls where the need is greatest — WARN channels donations straight to that work.

Ease the pressures

Avoid the wildlife trade and souvenirs, never buy wild animals as pets, and choose sustainable, habitat-friendly products — the threats behind the axolotl's decline fall when demand does.

Spread the word

Share accurate, sourced information about the axolotl. Wider awareness is what turns concern into lasting protection.

Support Habitat Protection Donate monthly

Axolotl: Frequently Asked Questions

How can I help save the axolotl?

The most effective way to help the axolotl is to fund the frontline rescue and habitat protection that keeps the species alive — WARN channels donations to partner-led teams working where the need is greatest. You can also ease the pressures behind its decline by avoiding the wildlife trade and souvenirs, never buying wild animals as pets, and choosing sustainable products, and by sharing accurate information to build wider support. See the ways to help below, or support WARN's Support Habitat Protection.

Are axolotls endangered?

Yes. The IUCN lists the axolotl as Critically Endangered in the wild, where it survives only in the Xochimilco canal system near Mexico City. Estimates suggest just a few hundred or fewer remain, and some surveys find almost none. This is despite the species being extremely common in captivity, where hundreds of thousands live in labs, classrooms and home aquariums.

Can axolotls really regrow their limbs?

Yes. Axolotls can regenerate entire amputated limbs, complete with bone, muscle, nerves and skin, usually within weeks. They can also repair the heart, spinal cord, retina and even parts of the brain without scarring. After injury, cells gather into a structure called a blastema that rebuilds the missing tissue. This rare ability makes the axolotl a key animal in regenerative medicine research.

Why do axolotls stay babies their whole lives?

Axolotls show neoteny, meaning they keep larval features and stay aquatic for life instead of metamorphosing into land-dwelling adults like most salamanders. This happens because their bodies produce very little thyroid hormone, the signal that normally triggers metamorphosis. They keep their feathery external gills and tail fin yet still become sexually mature and breed in this larval-looking form.

Where do axolotls live in the wild?

Axolotls are native only to the canal and wetland system of Xochimilco on the southern edge of Mexico City, and historically to the now largely drained Lake Chalco. This single, shrinking habitat is the reason the species is so vulnerable: as Mexico City has expanded, the wetlands have been polluted, drained and invaded by non-native fish, leaving very little suitable habitat.

What do axolotls eat?

Axolotls are carnivores. In the wild they eat small prey such as worms, insects, insect larvae, small crustaceans, molluscs and tiny fish, sucking them in with a rapid gulp. In captivity they are commonly fed earthworms, bloodworms and specially formulated pellets. Their permanently larval anatomy means they hunt entirely underwater, detecting prey by movement and smell.

What is the difference between an axolotl and a salamander?

An axolotl is a salamander, specifically a species in the mole salamander family. The key difference is that most salamanders metamorphose into terrestrial adults, losing their gills and living partly on land. The axolotl does not: through neoteny it keeps its gills, tail fin and aquatic lifestyle for life. Its close relative, the tiger salamander, does undergo full metamorphosis.

Are axolotls dangerous?

Axolotls are not dangerous to people. They are small aquatic salamanders native to the Xochimilco canal system near Mexico City. Critically Endangered in the wild — with fewer than a thousand adults possibly remaining — they are abundant in laboratories and home aquariums, famous for regenerating limbs, parts of the heart, spinal cord and even portions of the brain.

How long do axolotls live?

Axolotls typically live around 10–15 years according to this guide's quickFacts and stats. They remain aquatic and larval-looking for life through neoteny, keeping feathery external gills and breeding while still in that form. Wild survival is severely threatened despite their popularity in captivity.

How big is an axolotl?

Axolotls are typically about 23 cm long, with a range of roughly 15–45 cm according to this guide's quickFacts. They are neotenic salamanders that never fully metamorphose, staying aquatic with external gills. The species is listed on CITES Appendix II and Critically Endangered in the wild.

Sources & References

Population figures, conservation status and biological facts on this page are drawn from authoritative scientific and intergovernmental sources.

Terms used on this page

Plain-English definitions, from our wildlife and conservation glossary.

Latest Axolotl Stories

Quick, fact-checked reads on the axolotl — amazing facts, key questions and the threats it faces.

Species

12 Amazing Facts About Axolotls (They Regrow Their Own Brains)

Limb, spinal cord and partial brain regeneration, permanent larval form, and near-extinction in the wild. Twelve facts.

Read the story

Explore More Species

Every animal in our network faces a crisis. Learn about the others.

View all wildlife guides

Support Habitat Protection