Like humans engaged in risky activities, group members of some animal societies take turns
acting as sentinels. Explanations of the evolution of sentinel behavior have frequently relied …

1. In social mammals where group members cooperate to detect predators and raise young,
members of small groups commonly show higher mortality or lower breeding success than …

During hot weather, terrestrial animals often seek shaded thermal refugia. However, this can
result in missed foraging opportunities, loss of body condition and impaired parental care …

Functional interpretations of helping behaviour suggest that it has evolved because helpers
increase their direct or indirect fitness by helping. However, recent critiques have suggested …

In cooperative groups of suricates (Suricata suricatta), helpers of both sexes assist breeding
adults in defending and feeding pups, and survival rises in larger groups. Despite this …

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 …

One important but understudied way in which climate change may impact the fitness of
individuals and populations is by altering the prevalence of infectious disease outbreaks …

Recent theoretical work suggests that the distribution of reproduction, or degree of
reproductive skew, in animal societies depends crucially on (1) whether dominant …

In vertebrate societies where young are reared communally, nonbreeding helpers are
usually closely related to young but often vary widely in their contributions to feeding them …

Evolutionary explanations of cooperative breeding based on kin selection have predicted
that the individual contributions made by different helpers to rearing young should be …