Axolotl

Australians and New Zealanders frequently refer to the Axolotl as the Mexican Walking Fish, though the Axolotl is not a fish but an amphibian, a salamander, part of the order Caudata/Urodela. Because it's a salamander, it's part of one of the three branches of class Amphibia, which also includes the frogs and toads (the Anurans), and the mainly eel-like order, Gymnophiona, which are also known as the Caecilians. One common misconception is that axolotls and other salamanders are lizards or reptiles. In fact, amphibians are a completely separate group of animals. For example, did you know that reptiles and human beings have a four-chambered heart? Well amphibians have only three chambers. That's just one example of how appearance can be deceiving: salamanders might look like lizards, but they are very different indeed.