Axolotl (Ambystoma mexicanum)

Axolotl is an amphibian that lives in Lake Xochimilco and Lake Chalco, near Mexico City. It is Mexico's national animal. It is a type of salamander that doesn't experience metamorphosis. They look like juveniles for the rest of their lives. How do they reproduce if they are forever young? 

At some point, the only adult attribute they develop is the ability to breed. What makes the Mexican walking fish unique is its ability to heal itself2. It can regenerate body parts like the limbs, eyes, and some parts of the brain. Unfortunately, they are critically endangered because of human activities.