ABSTRACT
The number of chimpanzees visiting feeding area gradually increased and by the middle of 1964 a total of forty-five individuals, comprising all age groups of both sexes, had become frequent visitors. Maternal protection extends over the whole period of infancy and, indeed, to the juvenile and on rare occasions the adolescent. M. K. Harlow suggests that contact clinging behaviour, at least in rhesus monkey infants, plays an important role in eliciting maternal behaviour. The newborn infant of a captive rhesus monkey was jerked from its mother when the placenta, which was attached, caught on a branch. Suckling continues throughout infancy. During infancy, affectionate behaviour, play and grooming are all probably helpful in establishing a strong social tie between a mother and her offspring. Grooming behaviour, as a social interaction between a mother and her offspring, appears gradually to become more important as the offspring grows older.
