Male mammals show a diverse array of mating bonds, including obligate monogamy,
unimale and group polygyny and promiscuity. These are associated with a wide variety of …

From the snub-nosed monkeys of China to the mountain gorillas of central Africa, our closest
nonhuman relatives are in critical danger worldwide. A recent report, for example, warns that …

The single most important difference between the sexes is the difference in their investment
in offspring. The general rule is this: females do all of the investing; males do none of …

Sex differences in dispersal and inter-group transfer by birds and mammals are often
considered to be evolved responses to the phenomenon of inbreeding depression. This …

In most social mammals, males leave their natal group to breed in other groups whereas
females commonly remain in the same group throughout their lives1. In a few species …

Male vervet monkeys in Amboseli National Park, Kenya, disperse nonrandomly from their
natal groups at sexual maturity, and migrate to specific neighboring groups with their …

Social learning in animals is now well documented, but few studies have determined the
contexts shaping when social learning is deployed. Theoretical studies predict copying of …

Male dispersal from the birth group is common in the majority of social mammals, and in
many species, males also engage in secondary or breeding dispersal following natal …

Predation pressure has long been proposed as a determinant of mammalian social systems.
Group size and composition were compared for 121 populations of cercopithecoid primates …

A very aggressive young adult male entered one of three long-term study groups of yellow
baboons, Papio cynocephalus, approximately 3 weeks after an immobilization project …