Dolphins should be the most friendly marine animals to human beings. Those who accidentally fall into the sea will be unlucky if they meet sharks, but if dolphins are nearby, they may come to save you in droves.

Sex dolphins usually look for a female dolphin in groups and then mate with it. Generally, after four or five times, the female dolphin will try to escape. If the female dolphin tries to escape, the male dolphin will hit it with his tail.