How the body and brain respond to a gentle stroke dynamically changes depending on how familiar someone is with the other person.

Outgroup conflict can negatively impact general reproductive behaviour, egg investment, and parental care, resulting in decreased reproductive output even in the absence of physical confrontations.

A detailed discussion of the broad range of immediate, delayed, cumulative, and third-party fitness consequences arising from outgroup conflict showcases the importance of this neglected aspect of sociality as a powerful and widespread evolutionary force.

While men’s mating success is predicted both by their strength/muscularity, voice pitch, height, and testosterone levels, their reproductive output is only predicted by strength/muscularity.

In the dioecious plant genus Leucadendron, shifts to sex-biased gene expression occurred predominantly in genes with ancestrally high rates of expression evolution, and were not correlated with morphology.

After experimentally simulated within-group conflict, dwarf mongoose bystanders engage in post-conflict management behaviour with a temporal delay.