1. Swim by force: Dolphins swim faster, but ships are faster. The reason why they swim faster is that they have strong swimming ability, and part of the reason is that dolphins know how to borrow power. Because the water pressure in the vortex of ships is relatively low, they will swim more easily. Researchers have shown that when swimming by force, dolphins hardly need to swing their tails, and their breathing speed will drop significantly.

2. Get food: When a ship passes by, it is easy to get fish and other creatures around it. At this time, it is very convenient for dolphins to hunt, and their speed of getting food will be accelerated.

3, mistaken for the same kind: Dolphins communicate through ultrasonic waves when swimming in water. When their ultrasonic waves touch the sonar of ships, they will mistake ships for the same kind, and then chase each other with ships.

Dolphins are generally not too dangerous when chasing ships, because they swim faster and react faster. Under normal circumstances, it is not too dangerous for dolphins to follow ships. But there are propellers at the bottom of the ship. If dolphins swim below the ship, they will probably touch the propellers and get injured.