During the latter half of the last century, evidence of reproductive competition between males
and male selection by females led to the development of a stereotypical view of sex …

Social interactions are a ubiquitous feature of the lives of vertebrate species. These may be
cooperative or competitive, and shape the dynamics of social systems, with profound effects …

In many animal societies, dominant individuals monopolize reproduction, but the tactics they
employ to achieve this are poorly understood. One possibility is that aggressive dominants …

In most animals, the sex that invests least in its offspring competes more intensely for access
to the opposite sex and shows greater development of secondary sexual characters than the …

Cooperative behavior is a hallmark of the primate order. Cooperation is therefore an area of
intensive theoretical research in biology, anthropology, political sciences and economics, as …

In many animal societies where hierarchies govern access to reproduction, the social rank of
individuals is related to their age and weight,,,, and slow-growing animals may lose their …

The contribution of bacterial fermentation to the production of vertebrate scent signals has
long been suspected, but there is still relatively little information about the factors driving …

Stress hormone measurements can reinforce and refine hypotheses about the costs of
particular contexts or behaviors in wild animals. For social species, this is complicated …

The social environment is a major determinant of morbidity, mortality and Darwinian fitness
in social animals. Recent studies have begun to uncover the molecular processes …

Many mammals use acoustic signals to communicate with conspecifics. Rock hyraxes
(Procavia capensis) are social mammals whose vocal communication is usually restricted to …