This creature is a salamander known as the axolotl, named after Xolotl, the Aztec god of fire and lightning, who could take on the form of a salamander. It can grow up to a foot in length. It is unusual among amphibians, in that it remains aquatic through its entire life cycle, relying on its external gills to breathe. In addition to being able to regrow body parts—including their hearts, spines, and brains—axolotls can accept organs and limbs transplanted from other axolotls without risk of rejection, a trait that makes them of interest for medical research. However, axolotls are nearly extinct in the wild. (New Thinking Allowed)