The moral of grey whale

The moral of grey whale: freedom, pursuit, courage and uniqueness; Symbols of gray whales: motherhood, rebirth, ambition, courage and freedom.

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Whale is the name of cetaceans in marine mammals, which can be divided into toothed whales and baleen whales. Among cetaceans, the dolphin family is included.

Whales live in the ocean. Whales have a very thick layer of fat under their skin, that is, whale oil, which can keep whales warm and store energy for emergencies.

Because there are many special structures in the whale, it can hold its breath for a long time and slow down its heartbeat, so when it sinks to the bottom of the sea, it will take a long time to surface again. In addition to the structure of storing oxygen, when a certain part of the body needs a lot of blood supply, the body will have a special centralized supply function.

Whales are not fish, but mammals. The common feature of cetaceans is constant body temperature, about 34℃-36.5℃. The skin is bare, the body hair is degenerated, there are only a few bristles in the nose and mouth, and there are no sweat glands and sebaceous glands. The fat under the skin is very thick, which can keep the body temperature and reduce the proportion of the body in water. The skull is developed, but the skull is smaller, the face is larger, the frontal bone and maxilla are obviously prolonged, forming a long snout.

The neck is not obvious, the cervical vertebra is healed, and the head is directly connected with the trunk. Their eyes are small, without lacrimal glands and transient membranes, and their eyesight is poor. There is no outer ear shell, and the external auditory canal is very thin, but the hearing is very sensitive. It can feel ultrasonic waves, find food by echolocation, contact companions or avoid enemies.