#ambystoma mexicanum

An axolotl exhibits neoteny by retaining many of its juvenile characteristics into adulthood. Among this salamander’s defining features are exposed gills that flare out from the base of its head.

Image credit: Tim Flach

Axolotls (Ambystoma mexicanum) are neotenic amphibians, which may be related to their ability to regenerate limbs. Although very common in the pet trade, they are Critically Endangered in the wild due to habitat loss and introduced species. 

Photos:Poecilia,Jan-Peter Kasper