One of the enduring puzzles in biology and the social sciences is the origin and persistence
of intraspecific cooperation and altruism in humans and other species. Hundreds of …

Darwin developed the theory of sexual selection to account for the evolution of weaponry,
ornamentation and other secondary sexual characters that are commonly more developed …

The author shares some lessons learned from a lifetime of working with and thinking about
groups. Three types of groups are described, including the impact they have on the …

Social organisation in animals takes many forms. It includes assemblages of territorial
animals, dominance hierarchies and social groups, among other things. The basic tenet that …

Some individuals (helpers) in cooperatively breeding species provide alloparental care and
often suppress their own reproduction. Kin selection is clearly an important explanation for …

Dominance captures behavioural patterns found in social hierarchies that arise from
agonistic interactions in which some individuals coercively exploit their control over costs …

Social interactions are ubiquitous across the animal kingdom. A variety of ecological and
evolutionary processes are dependent on social interactions, such as movement, disease …

Conflicts of interest are part and parcel of living in a social group, although these can reduce
the fitness of individual members. Here I show that clownfish (Amphiprion percula) adjust …

Paternity is often determined by competition between the ejaculates of different males.
Males can also use particular behaviours or structures to manipulate how females use …

Hamilton's inclusive fitness theory represents one of the most important developments in
evolutionary biology. In particular, the idea that individuals benefit from the reproduction of …