National Geographic : 1978 Oct
Trialogue. During an informal picnic on the campus (above) the following conversation occurs: Penny: "Michael, do you want a cracker?" Michael: "Eat." Koko: "Don't." Penny explains that Koko means, "Don't give it to him. Give it to me." As human parents can understand, the young goril las have a hard time sharing. "It can be a big deal who gets what first," says Penny. "Little wars erupt. They pound each other like you wouldn't believe." In a mellow mood, Koko lies on her back (center) and taps her armpit-the sign for "tickle." Michael reaches over to oblige. Michael offers Koko the back of his hand (left), a gesture of sub mission among gorillas in the wild. Koko responds with a kiss. When Michael does not want to be bothered, he can be quite ag gressive-a mood that Koko re spects. Fifteen years from now he will weigh some 400 pounds, nearly twice as much as she. Pen ny hopes the pair will mate.