The mudskipper is an animal with strange habits and characteristics, because sometimes they live in the water, but sometimes they live on the beach on the shore, and sometimes they can even be found in the trees. Some people think that mudskippers are amphibians because they can adapt to two different living environments at the same time, but they are not. In terms of category, mudskipper belongs to Osteichthyes, a kind of fish, and their name also has "fish", so the category attribute is relatively clear. Amphibians refer to animals in the class Amphibia, while mudskippers do not belong to the class Amphibia.
As a fish, mudskippers also have some key characteristics that are different from amphibians. For example, in terms of body structure, mudskippers have various fin structures, which allow them to move freely in the water, but amphibians do not have fins, which are one of the unique structures of fish. In addition, from the point of view of respiratory organs, many amphibians have lungs after they develop into adults, and breathe with lungs, but mudskippers are different, they breathe with oral mucosa or skin in addition to gills.
? As mentioned above, the mudskipper belongs to fish. The respiratory organs of fish are basically gills, and they are not particularly advanced animals, so they do not have the respiratory organs of lungs. Lungs, as the structure of breathing, are relatively advanced and efficient. Only higher animals have them. Human beings and some other mammals use lungs to breathe. The mudskipper, on the other hand, is a fish and has no lungs. When they are in the water, the respiratory organs they use are gills. When they are out of water, they do not use their lungs to breathe, but use the mucous membranes and skin in the mouth to assist breathing.