If this behaviour fails to impress the female, they will chase after her, bang into her, bite her and slap her to force her into line. Obviously it would be impossible for a single male to do this on his own, as there is no size difference between the sexes and the female could flee easily. The behaviour of these dolphins seems to be unique in the animal kingdom. Many male primates, including chimpanzees and baboons, are known to form gangs to attack rival groups, but none of them have ever been known to solicit a second group to attack a third. These dolphin alliances are not permanent and can shift from day to day.
Dolphins are highly opportunistic, always calculating who is a friend and who is a foe.
There is also evidence that the females form equally sophisticated alliances in order to try to thwart male encroachment and that these groups will chase the males if one of their number is captured. Some species of dolphin, such as the bottlenose, usually act by consensus, spending hours nuzzling each other and generating an eerie nautical symphony of squeaks, whistles, barks, twangs and clicks. It may be that the development of these communication skills has led to greater intelligence among dolphins than other animals.