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The chimpanzee, which is known to be the animal most closely related to humans, is the most intelligent of the nonhuman mammals. This primate plays in an elaborate, complicated way. Chimpanzees chase each other, wrestle, and invent a variety of games. Only humans play in a more complicated way. Other primates such as monkeys and gorillas also like to play, but not as much as chimpanzees do. Also, some other vertebrates such as dolphins are intelligent and play among themselves and with other animals including humans. For these intelligent animals, play is a way of having fun. But it is also a way to be creative and to interact with their environments in new ways. Perhaps human creativity in music, art, and science begins as a kind of play.