closeup on the cupper colored neotenic , gilled, mexican axolotl, ambystoma mexicanum

ambystomatidae herpetology underwater endangered vertebrate salamander ambystoma mexicanum amphibian protected neotenic amphibia chordata coloured predator wildlife outdoors closeup colored mexican axolotl caudata biology zoology neoteny cupper gilled mexico single animal nature tailed macro larva water gill wild mole newt