Hierarchy is a reality of group life, for humans and for most other group-living species.
However, there remains considerable debate about whether and when hierarchy can …

Social behaviour has a key role in animal survival across species, ranging from insects to
primates and humans. However, the biological mechanisms driving natural interactions …

The hierarchical organization of dominance relations among animals has wide-ranging
implications in social evolution. The structure of dominance relations has often been …

Chimpanzees have been the traditional referential models for investigating human evolution
and stone tool use by hominins. We enlarge this comparative scenario by describing …

Dominance behaviours have been collected for many groups of animals since 1922 and
serve as a foundation for research on social behaviour and social structure. Despite a …

Body mass is fundamental for understanding growth, health, and aspects of life history but
records of body mass are rarely available for wild primates. We documented the body mass …

Testosterone and cortisol are hormones expected to play a major role in competitive
behaviours (ie aggression), and are related to rank and hierarchical stability. Through a non …

Research on Old World primates provided the foundations for understanding competitive
strategies resulting from social and ecological pressures. The neotropical primate, Cebus …

In most group-living animals, a dominance hierarchy reduces the costs of competition for
limited resources. Dominance ranks may reflect prior attributes, such as body size, related to …

The intensification of poultry production systems has brought major changes in domestic
fowls' physical and social environment. The management of these birds has received …