What kind of animal is a dolphin? Breathe with what? What is the purpose of the tail?

Dolphins are very lovely marine creatures. Every time they go to the aquarium, they are very popular and can perform a lot of skills. Dolphins are very human, and there are many news reports about people being rescued by dolphins in the ocean. The dolphin has a streamlined shape, a pointed mouth and a pleasant call. Let's take a look at what kind of animals dolphins are. Breathe with what? What is the purpose of the tail?

What kind of animal is a dolphin?

Dolphins are cetacean aquatic mammals, mostly small toothed whales, distributed in salt and fresh water in oceans, inland seas and estuaries of rivers all over the world, and a few inland rivers.

Dolphins have a history of more than 20 million years. Their bodies are very flexible and they are the fastest moving mammals in the water. They hear very well, whether in the water or in the air. Dolphins are very popular because of their high IQ, lively, gentle and friendly personality.

What kind of breath do dolphins use?

Most of the fish in the sea breathe on their gills. Is it the same with dolphins? Dolphins, similar to us, breathe through the lungs through the mouth and nose, with nostrils on top of the head, so they often float to the surface to breathe.

What is the function of a dolphin's tail?

The dolphin's tail is the main organ that pushes it to swim forward and change direction, and it is also a sharp weapon for it to keep swimming fast. Dolphins swim quickly, usually at a maximum speed of about 30-40km per hour. Individual species of dolphins can exceed 55km/h per hour and can maintain for a long time, making them the champion of long-distance swimming in the ocean.

Dolphins swim in a very unique way, which is different from that of other whales. The whole body jumps out of the water at a small angle and then enters the water at a small angle. The butterfly kick we are familiar with also has a common name, dolphin kick, because this kick is very similar to the movement of dolphin tail.

At present, all genera and species of Dolphinidae are listed in China's National key protected Wildlife list, of which the Chinese White Dolphin (Sousa chinensis) is a national first-class protected animal, and the other dolphins are national second-class protected animals. Because about 1/4 of the whales and dolphins in existence are threatened to varying degrees. Like human hunting, although humans are fishing, there are times when they accidentally catch dolphins and become delicious food in the mouth of human beings. Others are caught and raised in an aquarium in an artificial environment, which shortens the life span of dolphins because dolphins are prone to disease in water with too much chlorine.

Now global warming has led to sea level rise and triggered changes in the ecological environment such as precipitation, water temperature and salinity, resulting in dolphins being unable to adapt to their surroundings and threatening their lives. There are also various projects built by humans that prevent dolphins from migrating and other activities.