“…Preliminary field studies have suggested that, similar to the hamadryas and the gelada baboons, Guinea baboons travel (or aggregate at sleeping sites) in bands or herds of hundreds of individuals, while most of their affiliative and reproductive activities appear to be concentrated in smaller, male-centered units [De Keyser, 1956, cited by Boese, 1975Bert et al, 1967;Dunbar and Nathan, 1972;Byrne, 1981;Anderson and McGrew, 1984;Galat-Luong et al, in press]. Behavioral studies in captivity, primarily involving the colony of Guinea baboons at Brookfield Zoo in Chicago, have shown that adult males maintain 'harems' of 2-5 females with which they mate, and that most females within the group copulate with only 1 or 2 males [Boese, 1975;Anthoney, 1975;Maestripieri et al, 2005]. However, the extent to which these mating units also correspond to social units is largely unknown.…”