Group living is common across many species, and group sizes range from small (e.g., the Elephant herd and Lion pride) to very large (e.g., bird flocks or fish schools). Different species evolved ...

Within-group cooperation (i.e., among closely related individuals), is to varying degrees observed among a significant number of animal species. However, peaceful encounters and cooperation between ...

Behavioral activation is an approach to mental health that involves someone using behaviors to influence their emotional state. It is often a part of cognitive behavioral therapy (CBT), but it can ...