Axolotls are amphibians that never grow out of the larval stage, so they remain aquatic for their whole life. As relatives of the on land living salamanders, they are famous for their regeneration ability which enables them to re-grow entire limbs and even portions of the brain and spine.
The name “Axolotl” comes from the Aztec language, “Nahuatl” of which the most commonly accepted translation is “water-dog”.