Sharks don't eat dolphins. To be precise, sharks usually can't beat dolphins and can't eat dolphins. Because except tiger sharks, other sharks can't beat dolphins. The first is that dolphins are faster and more flexible. In addition, dolphins are all group activities. If a dolphin is attacked, they will call their companions and attack sharks together. At this time, sharks can't hurt dolphins, and they are easily killed by dolphins. Therefore, under normal circumstances, sharks can't beat dolphins, let alone eat dolphins.

Sharks are cartilaginous fish, which are different from ordinary teleost fish. They don't have floats to control their suspension in the water, so they can only keep themselves suspended by activities. In addition, the fins of sharks are also special in structure. They are similar to the wings of airplanes, which are bent above and flat below. This structure allows sharks to keep swimming forward, and if they don't swim, their bodies will sink to the bottom.

In addition, sharks don't have gill covers, so they can only pass water through their gills by swimming constantly, so that the oxygen in the water flow can meet their needs. If they don't swim, they may suffer from lack of oxygen.