Meet Speckled Jim and Rho.
They are my pet axolotls, they are a type of salamander but they are "neotenic" meaning (under normal conditions) they spend their entire lives and breed as juveniles. Imagine a type of frog or toad that never became a frog or toad but did it's entire life cycle as a tadpole. That's what these weird creatures do, living out their entire lives in the water, although under certain circumstances they can "morph" into a really handsome land dwelling salamander.
They are also able to regenerate almost any part of their body. Almost any injury to limb or organ, including eyes and brain, if it does not kill the animal outright then it can regrow the lost or damaged body parts. For this reason they are used by scientists researching new types of regenerative medicine. In fact, it's possible this scientific interest is saving the species from extinction because their natural habitat Lake Xochimilco and Lake Chalco in central Mexico have been reduced from once vast lakes to little more than a canal and it's estimated there are only several hundred left in the wild.
They are able to "breathe" through the frilly gills around their necks and absorb oxygen from the water through their skin but can also breathe air as they are equipped with lungs as well.
They use a keen sense of smell to hunt out food, mainly aquatic invertebrates. To catch them they make a vacuum in their mouth and throat, then open up their mouth and suck up everything in the area around their heads. The best diet we can provide them with in captivity is earth worms!