Whales and dolphins have been trained to perform tricks in captivity. While these may relieve some of the boredom, they would no doubt be happier if they could carry out more natural behaviour. During a show, dolphins are fed after every trick as a reward. They may perform simply for the reward of a fish. 

Bottlenose dolphins are highly active and can be frequently seen tail slapping, bow and
wake-riding, and breaching. They will chase one another, roll over each other and carry objects such as seaweed. They can be very active when chasing fish, sometimes breaching and playing with them. We often see the dolphins of Port Phillip playing with their food, including
​bow-riding vessels with a fish in their mouth.