Abstract
Birth and perinatal behaviour in five family groups of the common marmoset are described. Information is given on 16 births, seven of which are described in detail. The birth process was divided into five stages; data are presented on the durations of the stages and the behaviours exhibited by the female in each stage. Infant marmosets cling unaided to the pelage of the female from birth, and the behaviour of neonates and the reactions of the female to infants are discussed. The interactions of other group members to the mother and neonates were analysed. The adult male's first interactions with the neonates appeared to occur much earlier (less than one hour after birth) than in other non-human primate species. Perinatal behaviour in marmosets is compared to that recorded in other non-human primate species and discussed in relation to the social organisation of C. j. jacchus.
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