The nature of play in animals has been long debated, but progress is being made in
characterizing play and its variants, documenting its distribution across vertebrate and …

Humans are a puzzling species. On the one hand, we struggle to survive on our own in the
wild, often failing to overcome even basic challenges, like obtaining food, building shelters …

Human cooperation is highly unusual. We live in large groups composed mostly of non-
relatives. Evolutionists have proposed a number of explanations for this pattern, including …

The age of individuals has consequences not only for their fitness and behaviour but also for
the functioning of the groups they form. Because social behaviour often changes with age …

Social interactions are characterized by distinct forms of interdependence, each of which
has unique effects on how behavior unfolds within the interaction. Despite this, little is known …

Many of the most important properties of human groups–including properties that may give
one group an evolutionary advantage over another–are properly defined only at the level of …

Over the past century, ecologists have attempted to understand patterns of species diversity
by showing stable coexistence arising from a baseline expectation of competitive exclusion …

Alloparental care is central to human life history, which integrates exceptionally short
interbirth intervals and large birth size with an extended period of juvenile dependency and …

In this book, acclaimed economist Herbert Gintis ranges widely across many fields—
including economics, psychology, anthropology, sociology, moral philosophy, and biology …

It has been suggested that animals may have evolved cooperative breeding strategies in
response to extreme climatic conditions. Climate change, however, may push species …