CRCritically EndangeredPartial review

Axolotl

Ambystoma mexicanum

Axolotl (Ambystoma mexicanum) showing its feathery external gills.

Axolotl (Ambystoma mexicanum).

Image: FakirNL, CC BY-SA 4.0, via Wikimedia Commons.

At a glance

IUCN category
CR · Critically Endangered
Animal group
Reptiles & Amphibians
Population trend
Decreasing
Last verified

Conservation overview

The axolotl is a salamander famous for keeping its larval form — including feathery external gills — throughout life, a trait called neoteny. Its wild population is assessed as Critically Endangered.

Although axolotls are common in aquariums and laboratories worldwide, the wild population survives only in the remnant lake and canal system of Xochimilco near Mexico City.

Range & habitat

Native only to the remnant lake and canal system of Xochimilco near Mexico City.

Major threats

Threats below are drawn from the authoritative sources listed on this page. For the current, complete assessment, see the IUCN Red List.

  • Habitat loss and urban water pollution
  • Invasive introduced fish such as tilapia and carp
  • Reduced and degraded wetland habitat

Why it matters

The axolotl is a key model animal for studying regeneration, and its situation shows how a species can be abundant in captivity yet nearly gone in the wild.

Abundant in captivity and research, but the wild population in Xochimilco is assessed as Critically Endangered.

Axolotl resting on the bottom of an aquarium.

An axolotl — Critically Endangered in the wild.

Image: Ruben Undheim, CC BY-SA 2.0, via Wikimedia Commons.

Sources

Sources for Axolotl

Frequently Asked Questions

If axolotls are everywhere in pet shops, why are they endangered?
The captive and pet populations are large, but the IUCN assessment concerns the wild population in Xochimilco, which is Critically Endangered due to habitat loss, water pollution, and invasive fish.
Why does the axolotl keep its gills?
It is neotenic — it reaches adulthood while retaining larval features such as external gills, instead of metamorphosing onto land like most salamanders.

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