John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), melanistic form, critically endangered in the wild, captive, native to Mexico

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), white or leucistic form, critically endangered in the wild, captive, native to Mexico

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), white or leucistic form, critically endangered in the wild, captive, native to Mexico

John Cancalosi / Axolotl / Mexican salamander (Ambystoma mexicanum), white or leucistic form, critically endangered in the wild, captive, native to Mexico

Chris Mattison / Axolotl (Ambystoma mexicanum) against white background. Captive. Endemic to Central America.

Pete Oxford / Mexican axolotl (Ambystoma mexicanum) Albino, captive, Critically endangered

Pete Oxford / Larva of the Mexican axolotl (Ambystoma mexicanum) swimming, captive, critically endangered

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) neotenic adult, native to Mexico

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) neotenic adult, native to Mexico

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) neotenic adult, native to Mexico

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) larva on day seventeen of development, native to Mexico, sequence 13/13

Pete Oxford / Mexican Axolotl (Ambystoma mexicanum) leucistic neotenic sub-adult, native to Mexico