Abstract
In several primate species, peer-group rearing conditions affect the development of social behavior. We compared the social behavior of adolescent chimpanzees reared in peer groups and in a family group to see whether chimpanzees raised under different regimes show differences in sexual behavior, teasing behavior, and grooming behavior and in their ability to cope with support strategies. Surprisingly, the lack of opportunity to practice or to watch in peer groups had no measurable effect on the development of normal sexual behavior in adolescence and adulthood. Peer-group individuals groomed each other as much as peers did in the zoo. Sex differentiation in reaction to teasing and in conflict initiatives may indicate only an earlier sex differentiation in the zoo than in the peer group. This result may be attributed to the difference in demographic composition of the groups instead of some inherent difference in skill. Peer-group chimpanzees simply cannot find adult partners with which they may preferably test their position. However, there was a lack of sex differentiation in the reaction to teasing and in the number of conflicts started; both are indications of lesser sex-role development in the peer-group adolescents. Furthermore, the frequency of giving support to peers in conflicts differed, which suggests a greater ability in zoo adolescents to cope with support strategies. Accordingly, providing more natural conditions than is usual in laboratories may still add considerably to chimpanzee well-being.
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