National Geographic : 1994 Dec
* Object play is much more interesting when the object is alive although the owners of these tails seem none too happy about it. In the Galapagos, "Sea lion pups are inveterate pranksters, always on the lookout for a new toy," says naturalist Tui De Roy, who photo graphed a pup (below) that repeatedly intercepted a marine iguana in a tide pool. "The sea lion would drag the iguana a short distance, release it, let it swim nearly to shore, and then grab it and drag it back out into the pool." Although adult chimpanzees kill and eat infant baboons, inno cence prevails in youth, when young chimps and baboons often become playmates. Chimp play runs the gamut-chasing, wrestling, sparring, play-biting, thumping and kicking, head butting, and tickling. New research shows that baboon play has environmental overtones: The more it rains and the greener the habitat, the more playful baboons become.