Walrus is a kind of animal that we are familiar with. In terms of classification, walruses belong to Mammalia, so they belong to mammals. As a mammal, walruses share some key characteristics with other mammals. For example, breeding methods, walruses breed viviparous. When the calf is born, there is a period of lactation, during which the calf does not leave the mother. This period of lactation is sometimes relatively long, may be close to 2 years. Another example is the way of breathing, as mammals, walruses also have lungs, and lungs are their breathing organs. Because they breathe with their lungs, they have to come out of the water.
From the point of view of living environment, walruses live in water, so in this respect, walruses belong to aquatic animals. Walrus is mainly distributed in the high Arctic and temperate regions near here, and there is no distribution in low latitudes. Therefore, in terms of category and living environment, walrus is an aquatic mammal, or marine mammal.
As mentioned above, judging from the category of the walrus, the walrus is a mammal in the class Mammalia. We cannot think that they are fish just because they mainly live in water, nor can we think that they are amphibians just because they can also survive on land. As a mammal, walruses reproduce viviparously and breathe with lungs. In fact, as a mammal, walrus is a relatively advanced animal, higher than fish and amphibians.
