In terms of category, dolphins belong to a mammal, not a fish. Even so, dolphins cannot live on land like many other mammals. After a long period of evolution, the hind limbs of dolphins have completely degenerated, and evolved some body structures adapted to water life, so dolphins live in water and belong to aquatic organisms.
Most dolphin species live in the ocean, and their body structure is adapted to the environment in the ocean. From the specific distribution depth, the distribution depth of different dolphins is different. Many dolphins prefer to live in shallow waters near the shore. But not all dolphins like to swim in shallow water. For example, "rough-toothed dolphins", although they can live in shallow and deep water, but still like deep water. There are also some dolphins that live in freshwater waters themselves, but there are fewer freshwater dolphins.
As mentioned above, dolphins mainly live in the ocean. Specifically, dolphins are widely distributed in the world's sea areas. Especially in tropical waters, because the water temperature is more suitable, the number of dolphins will be more. Specifically, the distribution of different species of dolphins is different. Some dolphins are distributed in many areas, such as the "bottlenose dolphin", which is distributed in the Pacific, Atlantic and Indian oceans. Some species have a relatively small distribution range, and some are only distributed in the sea areas of certain countries.
