You may have seen axolotls—an amphibian in the salamander family with a permanent smile and pink, feathery gills—in a pet store or as a plushie in a window, but the endearing animal's ...

The axolotl is an amphibian in the salamander family with a cute, permanent smile and feathery gills. You may have seen its likeness in the form of a plushie in a store window. Axolotls are ...