Social relations in groups of the black-capped capuchin (Cebus apella) in captivity. Interactions of group-born infants during their second half-year of life.

During the second half-year of life, capuchin monkey infants maintain close contacts to kin-related animals. Apart from these contacts, they frequently interact with other infants and juveniles 1 year older. During this period of life the 'peer phase' begins in the life of the infants. Furthermore, gender differences, especially in respect to social play, become obvious.