Rats show socially selective helping behavior based on familiarity with the type of rat, but not necessarily the individual rat.

Cooperation enables burying beetles to outcompete flies and adapt to a wider range of temperatures as thermal generalists.

Genes associated with age-based division of labor in ants exist in distinct regulatory and evolutionary contexts; genes up-regulated in young nurses are loosely connected and rapidly evolving while genes up-regulated in old foragers are highly connected and conserved.

Social interactions can have a direct effect on the composition of the gut microbiome in wild primates.

A mathematical model predicts the precise conditions for natural selection to favor the evolution of non-reproductive workers in insect colonies with haplodiploid genetics.

A computational model shows that natural selection can cause populations to evolve a distinctive population-level phenotype: the ability to transition between collective states in response to the environment.

Mathematical modeling supports a scenario where cell-cell adhesion gradually evolves through natural selection, leading to the emergence of cohesive aggregates in microbial populations.

Travel has a major influence on tool use in wild chimpanzees, suggesting that tool use reduced travel costs during hominid evolution.

Experiments in zebrafish reveal a new role for a critical hypothalamic transcription factor, orthopedia, in controlling developmental neuropeptide balance in a discrete oxytocin-producing neuronal circuit whose disrupted development affects social behavior.