Cooperatively breeding animals live in social groups in which some individuals help to raise
the offspring of others, often at the expense of their own reproduction. Kin selection—when …

The general belief that cooperation and altruism in social groups result primarily from kin
selection has recently been challenged, not least because results from cooperatively …

The Primate Origins of Human Nature (Volume 3 in The Foundations of Human Biology
series) blends several elements from evolutionary biology as applied to primate behavioral …

Highlights•Cooperation between males in reproductive contexts is an underappreciated and
puzzling behaviour.•We define male–male cooperation in reproduction and identify different …

An animal's social behaviour both influences and changes in response to its parasites. Here
we consider these bidirectional links between host social behaviours and parasite infection …

Social animals often form long-lasting relationships with fellow group members, usually with
close kin. In primates, strong social bonds have been associated with increased longevity …

Investigations into cooperative partner choice should consider both potential and realised
partners, allowing for the comparison of traits across all those available. Male bottlenose …

Variation in group size is ubiquitous in social animals, but explaining the range of group
sizes seen in nature remains challenging. 1–3 Group-living species occur most frequently in …

Highlights•Cooperative groups of greater anis compete for nesting areas.•Groups may
destroy entire clutches laid by neighbouring groups.•Length of tenure on the nest site, not …

Understanding the major evolutionary transition from solitary individuals to complex
societies is hampered by incomplete insight into the drivers of living in cooperative groups. 1 …