Axolotl

The axolotl is a type of salamander that never grows up fully, keeping its tadpole-like gills and staying underwater its whole life. Native to Mexico, these unusual amphibians can be tricky to tell apart from certain other salamander babies at first glance.

• Keeps its feathery external gills even as an adult.
• Becomes ready to reproduce without changing into a land-dwelling form.
• Often confused with tiger salamander larvae or mudpuppies.