Dolphins are quite similar to fish. For example, they both need to live in the water and cannot leave the water for a long time. For another example, their body shapes and structures also have certain similarities. However, they are two different kinds of organisms, and many of their characteristics are different. The way they breathe is very different, the organs they use to breathe are different. As a mammal, dolphins need lungs to breathe, not gills to breathe. In addition to the lungs, which are more important organs, they also need to use their mouths and noses, because the lungs alone can not exchange gases. Only by relying on their nostrils and mouths can dolphins first expel air and then inhale fresh air from the surface into their lungs.
As mentioned above, dolphins need to use lungs to breathe, but also need to use the nostrils and mouth. As a result, dolphins can only breathe with their heads above the water regularly, and can not stay in deeper parts of the water all the time. However, unlike humans, dolphins do not need to breathe very often, and they can have a long interval between two breaths, which means that they can stay in the water for a long time after breathing once. This is because the body structure of dolphins and humans and most other animals with a different structure, their lungs are very large, can hold a lot of air volume; And their ability to resist pressure is relatively strong, the hardness of the bone is also large.
Generally speaking, most dolphins can last 20-30 minutes after a breath. Specifically, there are different species of dolphins, and the specific time they can persist is also different. But no matter how long it lasts, dolphins have to come out of the water regularly, so we can observe dolphins jumping out of the water every once in a while.
