Male dolphins often fight other males over mates and territory Male groups often begin a mating encounter by directing a special popping sound at the female as a threat, warning her to stay close to the group. It is not yet known if all of the males in the group mate with this female or if only one does Males have been known to force sexual intercourse on females that they find attractive. This phenomena is similar to the human concept of rape. Dolphins are able to deliver devastating, quick blows with their beaks and tails Footage of the attacks has been made, showing dolphins flinging porpoises purposefully into the air like volleyballs. Some bottlenose dolphins of the Indian Ocean form groups that act like human gangs, clashing with other groups and robbing them of prizes Dolphins do not attack sharks.
Dolphins do bite humans when they ignore signals of agitation.