Axolotl (Ambystoma mexicanum)

AmphibianSalamanderNeotenic

Overview

The axolotl (Ambystoma mexicanum) is a remarkable salamander native to the lake system of Mexico City. Unlike most amphibians, it is neotenic: it keeps its larval features — including feathery external gills — and stays aquatic throughout its life rather than metamorphosing into a land-dwelling adult.

Axolotls are famous for their extraordinary ability to regenerate limbs, parts of organs, and other tissues, which makes them important in scientific research. They are also widely kept in aquariums.

Conservation note: there is a striking contrast between the wild and captive axolotl. While axolotls are abundant in laboratories and the aquarium trade, the wild population in its native lakes is considered critically endangered. Verify current status at iucnredlist.org.

Habitat & Range

In the wild, axolotls are restricted to the remnants of the ancient lake system around Mexico City, especially the canals and wetlands of Xochimilco. This habitat has been heavily reduced and altered by urbanisation, pollution, and introduced fish, which is central to the species' decline in the wild.

Diet

Axolotls are carnivores that feed by suction, drawing in prey such as worms, insect larvae, small crustaceans, molluscs, and small fish. They hunt mainly by detecting movement and scent in the water.

Behavior

Axolotls are fully aquatic and relatively sedentary, spending their time on or near the bottom. Their best-known trait is regeneration: they can regrow lost limbs and repair a range of tissues to a degree unusual among vertebrates. Because they remain in a larval-like state, they breed while still showing juvenile features — the defining quality of neoteny.

Human Interaction & Conservation

The axolotl is culturally significant in Mexico and is one of the most studied amphibians in biology, particularly for regeneration and development. Yet its wild habitat is critically threatened. Conservation focuses on protecting and restoring the Xochimilco wetlands and managing threats such as pollution and invasive species. For current status, consult AmphibiaWeb and the IUCN Red List.

More photos of the axolotl

Axolotl resting underwater, gills visible. — Axolotl (Ambystoma mexicanum), a neotenic salamander.
Image: Vassil, CC0, via Wikimedia Commons.

Frequently Asked Questions — Axolotl

Why does the axolotl keep its gills?

The axolotl is neotenic — it reaches adulthood and breeds while keeping larval features such as external gills and a fully aquatic lifestyle, rather than metamorphosing into a land salamander. This is a natural part of its biology, not a defect.

Can axolotls really regrow body parts?

Yes. Axolotls are famous for an unusual capacity to regenerate, including regrowing lost limbs and repairing a range of tissues. This makes them a major model animal in research on regeneration and development.

Are axolotls endangered if they're so common in aquariums?

It is a striking contrast. Axolotls are abundant in captivity — in laboratories and the aquarium trade — but the wild population in the lakes around Mexico City is considered critically endangered due to habitat loss, pollution, and introduced species. Captive abundance does not reflect the wild situation.

What do axolotls eat?

Axolotls are carnivores that suck in prey such as worms, insect larvae, small crustaceans, molluscs, and small fish, locating food by movement and smell in the water.

Sources and further reading

Authoritative wildlife references used for general educational context. Conservation status should always be verified against current IUCN Red List data. External links open in a new tab.

UniversityAmphibiaWeb — University of California, Berkeley — Authoritative database of amphibian biology and conservation
UniversityAnimal Diversity Web — University of Michigan Museum of Zoology — Peer-edited reference accounts for animal species
Wildlife referenceIUCN Red List of Threatened Species — Authoritative source for current conservation status