Sea lion (Sea Lion) is a semi-aquatic mammal in the family Sea Lionidae, which has become a landmark species in marine ecosystems due to its foldable flippers, outer ear structure and social habits. There are 7 genera and 15 species in the world, which are widely distributed in temperate to tropical waters, and are the key link between marine and terrestrial ecology. It is mainly distributed in the North Pacific Ocean, temperate waters of the southern hemisphere and some tropical waters; it inhabits coastal rocky areas, sandy beaches, rocks or floating ice edges, and prefers shallow seas with water depth <100 meters. Mainly to fish, cephalopods and crustaceans for food.

Sea lions are a collective term for carnivorous mammals in the sea lion family; There are a total of 5 genera and 14 species. Round head, fin shaped limbs as flexible as wings, and hind limbs that can turn backwards. Most sea lions have thick short fur on their bodies, with a thin layer of fluff underneath. However, the fur color of various sea lions is not consistent, mainly yellow brown and brown. Has a distinct tail, but is relatively short. Some species have long hair on their necks, similar to the mane of a lion, hence the name sea lion. He is known as the 'Lion King of the Sea'. Can dive to a depth of over 300 meters. At the same time, sea lions are also very intelligent sea beasts.