To whom the play signal is directed: a study of headshaking in black-handed spider monkeys (Ateles geoffroyi).

Spider monkeys shake their heads so as to facilitate amicable social contact. This occurs frequently during vigorous play fighting, and so is common during the juvenile period. Occasionally, juvenile spider monkeys use headshakes during nonsocial locomotor play. In this study, head shaking in early infancy and in adulthood was studied in a captive troop of… CONTINUE READING