a sea lion is a mammal that lives in the ocean. They belong to mammals, pinnipeds and sea lions. Therefore, seals belong to a kind of mammals. Many people think that sea lions are fish because they live in the water like fish, but this is a wrong view. As a mammal, sea lions have some very key characteristics that match the characteristics of mammals. For example, their reproductive mode is viviparity, their gestation period is relatively long, and there is lactation. What's more, they have lungs and use them to breathe.
As mentioned above, sea lions are mammals, so their most critical characteristics are mammalian characteristics. For example, breathing with lungs, reproduction with viviparity, lactation and so on. However, they are aquatic mammals after all, so they have some key characteristics compared with terrestrial animals. For example, the limbs of sea lions are more like fins, that is, flippers. In the long process of evolution, because the living environment of sea lions has changed from land to sea, their limbs and other body structures have adapted to the marine environment.
In addition, sea lions have some other characteristics. For example, in terms of appearance and sound, sea lions are similar to lions on land, so they get their name. For example, from the concept of marriage, sea lions are not monogamous, but a male sea lion with multiple female sea lions. When the breeding season comes, male sea lions and female sea lions will form a group to mate and breed.
