Walrus is a kind of marine mammal with large sea sheath, which has discontinuous distribution in Arctic Ocean and subarctic sea area of northern hemisphere. Adult walruses are easily identified by their prominent tusks, beards and bulk. Adult males in the Pacific may weigh more than 2000 kg (4400 lb), and only two of the flippers are larger than them. Walruses mainly live in shallow waters above the continental shelf. They spend a lot of life on sea ice, looking for benthic bivalve mollusks. Walruses are relatively long-lived social animals. They are considered as “important species” in the Arctic Ocean area.
Walruses play an important role in many native Arctic cultures. They kill walrus meat, fat, skin, ivory and bone. Walruses were widely hunted in the 19th and early 20th centuries. In the Arctic, the number of walrus is declining rapidly. Since then, their population has rebounded, although the Atlantic and Laptev walrus populations are still scattered and at low levels compared to before human disturbance.