The Meixcan Axolotl lives in Xochimilco, Mexico. They are close relatives of the tiger salamander. Axolotls can be quite large, reaching up to a foot in length, although the average size is closer to half that. They are typically black or mottled brown, but albino and white varieties are somewhat common as well. Axolotls are long-loved, surviving up to 15 years on a diet of mollusks, worms, insect larvae, crustaceans, and some fish. The Mexican axolotls has the rare trait of retaining its larval features throughout its adult life. This condition, called neoteny, means it keeps its tadpole-like dorsal fin, which runs almost the length of its body, and its feathery external gilsls, which protrude from the back of its wide head.