The axolotl may not be a very common pet, but it is definitely a unique one. Axolotls are a type of salamander and can be found in a variety of colors, including black, gray, gold, and white. But unlike most salamanders, they do not undergo metamorphosis from larval to adult form where breathing changes from gills to lungs. Instead, they remain aquatic their entire life. Thus, they are not pets you handle, but they can be quite entertaining to watch...