Also known as the Oriental Whale or Black Whale, it belongs to the subfamily of Whales in the order Cetiformes and the family Serranidae. It is a medium-sized whale mainly distributed in the North Pacific. The body color is usually dark gray or brownish gray, and parasitic organisms such as barnacles are often attached to the surface, which is also the origin of their "gray" color. The head is relatively large, without a distinct beak, and the jet hole is located at the highest point on the top of the head. The eyes are relatively small and located on both sides of the head. Mainly feeding on small crustaceans and small fish, with a unique way of foraging, searching for food on the seabed through benthic filter feeding. He is a famous long-distance migrant who migrates from foraging areas to breeding areas every year, with a migration distance of up to tens of thousands of kilometers.