A whale is by no means a fish, as many think, but a mammal. Of course, in appearance he differs from the cats and dogs familiar to people, but he also feeds his cubs with milk. Whales appeared on our planet as a result of evolution. Their distant ancestors lived not in the ocean, but on land. Therefore, the whale, as a new form of life on the planet, needed to adapt to the aquatic habitat.
Although whales live in water, they do not have gills. Nature has created lungs in their bodies for breathing. During the entire existence of whales, their respiratory system has constantly evolved. The nostrils gradually moved upward from the end of the head. In today's whales, the nostrils are represented by a pair of breathing holes. They make it easier to get oxygen.
When a whale is submerged in water, its airways are closed to keep water out. It has small valves for this purpose. In a whale, the digestive and respiratory systems are in no way connected with each other. Therefore, the ingress of water into the lungs through the mouth is excluded.
Whales emerge on the surface of the ocean every 10 minutes. But if necessary, they can be in the depths of the sea for up to 45 minutes. When a whale is shown on the surface, the first thing it does is empty its lungs of used air. Moreover, this procedure is accompanied by a strong noise that can be heard at a great distance. This is the reason for the appearance of a strong fountain. The fountain that the whale spews consists of exhaust air and water vapor.
In order to draw full lungs of fresh air, the whale releases a fountain repeatedly. After that, he sinks into the depths of the sea. It is known that some whales are capable of diving to a depth of 600 meters. And some especially large representatives are able to raise their tail above the water and jump into the air, completely breaking away from the water surface.