Dolphins can't speak human language. Although their IQ is relatively high compared with other marine creatures, there is still a certain gap with human IQ, so dolphins can't speak human language. Although dolphins can't speak human language, they have their own language system, and their peers can communicate with each other through ultrasonic waves. Especially after being attacked, they will emit sound waves and gather their companions nearby to fight against danger together.

Dolphins can't understand human language. Although many people can see dolphins perform in aquariums, and they will make specified actions according to human instructions during the performance, in fact they can't understand human language. Because dolphins performing in aquariums are trained for a long time, this is only their conditioned reflex, not really understanding human language.

Dolphins can interact with humans. They have a natural affection for humans. If they are dolphins performing in aquariums, they can kiss, touch and take photos. Dolphins living in the ocean also have a good impression on human beings. When they find that human beings are drowning, they will drag human beings to the shore to avoid drowning in seawater.