What is the reason why whales spray water?

A whale is a mammal, but its nose has no shell, and its nostrils grow on the top of its head. Living in water and breathing with the lungs can store a lot of air at a time, and you don't need to breathe on the surface often. But when it breathes to the surface, it breathes through its nose. When it breathes, the huge sound waves emitted by the sea water are caused by pressure. Whales are not fish, but mammals. It has many characteristics very different from fish. For example, the average fish swings its tail fin from side to side to make its body move forward, while the whale swings its tail fin up and down. They use the flippers at the front end to keep balance and control the direction of force. Some whales have fins at the upper end of their backs to keep their bodies upright. Whales usually feed on plankton, mollusks and fish. It is viviparous. Usually, each fetus gives birth to a child and feeds the calf with milk. Whales are social animals. They usually live in groups in the sea, but when whales breathe, they need to swim to the surface. At this time, whales breathe through the nostrils on their heads, and when they exhale, the water in the air will condense, forming the familiar fountain shape. Experts can even tell the species of whales from the height, width and angle of water spray. There are many kinds of whales, which can be roughly divided into toothed whales and baleen whales. Fin whales are used to living alone, and both males and females exist in the same sea area. Male fin whales can also use "singing" to attract female fin whales hundreds of kilometers away to mate with male fin whales in food-rich breeding grounds. The narwhal has a white abdomen and a black back with blue-gray or black-gray spots. It has a horn about 1 ~ 2 meters long on its head, which is actually a tooth. Before 20 12, most people thought that narwhals' tusks were only signs of secondary sexual characteristics, similar to the mane on the head of a male lion on land.