The axolotl (pronounced “AX-oh-lot-ul”) might look like something from a science fiction movie, but these remarkable amphibians are very real—and very special. With their perpetual smiles, feathery external gills, and extraordinary biological abilities, axolotls seem more like visitors from another planet than earthly creatures.

Often referred to as the “Mexican walking fish,” the axolotl is not a fish at all, but an amphibian. Its ability to regenerate limbs and even parts of its brain is nothing short of extraordinary. Inhabiting the lakes of Mexico, this creature retains its larval features throughout its life.

Axolotls originally inhabited a system of interconnected wetlands and lakes in the highlands of Mexico. They were known to inhabit the smaller lakes of Xochimilco and Chalco and are presumed to have inhabited the larger lakes of Texcoco and Zumpango.

Native only to the ancient lakes of Mexico City, axolotls are now critically endangered due to habitat loss and pollution. In this video, we explore their biology, habitat, and the science behind...