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Compared to adults, young primates experience a unique set of social and ecological pressures. Specifi cally, young primates tend to be slower, weaker, and less agile than adults due to smaller muscle mass and lack of complete integration between their central nervous and motor systems (Bradley and Bekoff 1989 ; Thelen 1989 ; Stehouwer 1992 ; Assaiante and Amblard 1993 ; Carrier 1996 ). These limitations can increase juvenile risk, defi ned as the ecological risk of death in individuals between weaning and sexual maturity (Janson and van Schaik 1993 ). Such risk can occur from predators which target younger weaker animals and adult conspecifi cs that displace juveniles from or more quickly secure prime feeding locals. |
