Teamwork and constant communication between team members is critical. Spinner dolphins leap in what appears to be a magnificent display of exuberance. What is actually happening is probably a signal to others to join them or to coordinate movements of the pod. And through constant touching. Like humans and some chimpanzees, dolphins use sex for reasons other than procreation.
Sex is as frequent as it is casual, a social tool used to strengthen and maintain bonds.
But beneath the harmony lies a darker side of dolphins. Gangs of strong males pick on younger or smaller dolphins. Bottlenose dolphins are even known to kill for reasons other than hunger. Cinematographer Paul Atkins, diving in the Bahamas with wild dolphins, heard the first sign of trouble before a particularly intense fight. The encounter that ensued including head ramming, biting, and blows from powerful flukes is surprisingly violent.