Friendship is the single most important factor influencing our health, well-being, and
happiness. Creating and maintaining friendships is, however, extremely costly, in terms of …

The question as to why primates have evolved unusually large brains has received much
attention, with many alternative proposals all supported by evidence. We review the main …

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 …

Most primates live in social groups in which affiliative bonds exist between individuals.
Because these bonds need to be maintained through social interactions (grooming in most …

Baboons (Papio spp.) are characterised by a large degree of variation in foraging behaviour
and dietary composition. Previous analyses have suggested that much of this can be traced …

Primate societies are unusually complex compared to those of other animals, and the need
to manage such complexity is the main explanation for the fact that primates have unusually …

The importance of thermoregulation as a constraint on behavior has received comparatively
little attention in relation to other ecological factors. Despite this, a number of studies …

Mammal social groups vary considerably in size from single individuals to very large herds.
In some taxa, these groups are extremely stable, with at least some individuals being …

An animal can only survive in a given habitat if it has enough time to find, process and digest
food whilst avoiding predation. The time it has for food acquisition is affected by the …

Global warming poses a threat to organisms with temperature‐dependent sex determination
because it can affect operational sex ratios. Using a multigenerational experiment with a …