The latest video in the Fish Focus Series - Axolotl. A threatened species in their Mexican homelands thanks mostly to habitat loss, these Mole salamanders are far more common in captivity and have been familiar pets and laboratory animals for decades. Axolotls demonstrate neoteny - the retention of juvenile traits - and are in essence tadpoles that never grow up and leave the water. These animals make great pets but need cool temperatures, low to moderate water movement and a carefully chosen su