Axolotl do not have fully-developed lungs or gills. Instead, they have a unique respiratory system that allows them to breathe through their lungs, skin, and gills.
* Lungs: Axolotls have two lungs that are located on the dorsal side of their body. These lungs are not as efficient as the lungs of other vertebrates, but they do provide some oxygen for the axolotl.
* Skin: The skin of axolotls is highly vascularized, which means that it contains a lot of blood vessels. This allows oxygen to diffuse into the axolotl's bloodstream through the skin.
* Gills: Axolotls also have gills, which are located on the sides of their head. These gills are rudimentary and do not function as fully-developed gills in other vertebrates. However, they do help to some oxygen for the axolotl.
The axolotl's unique respiratory system allows it to survive in a variety of environments. Axolotls can live in water, on land, or even in burrows underground. They are able to adapt to their environment and breathe in whatever way is most efficient.