Intergroup food transfers in wild golden lion tamarins (Leontopithecus rosalia)
Transfers of food between adults are uncommon in primates. Although golden lion tamarins (Leontopithecus rosalia), are unique among primates in the extent of food transfers, reports of food transfers between adults have so far been restricted to captive or reintroduced individuals. Here, I report the first six recorded events of adult-adult food transfers between individuals belonging to different groups. Given that individuals emigrate from their natal group to find reproductive opportunities, I suggest that those intergroup food transfers could be a way for individuals to estimate the quality or availability of potential mates or social partners. Here I propose an additional function of food transfers in wild golden lion tamarins: to create and strengthen social bonds outside of the family group.