Unlike most mammals, human fathers cooperate with mothers to care for young to an
extraordinary degree. Human paternal care likely evolved alongside our unique life history …

Natural selection will favor male care when males have limited alternative mating
opportunities, can invest in their own offspring, and when care enhances males' fitness …

Among mammals, post-reproductive life spans are currently documented only in humans
and a few species of toothed whales. Here we show that a post-reproductive life span exists …

This comprehensive introductory text integrates evolutionary, ecological, and demographic
perspectives with new results from field studies and contemporary noninvasive molecular …

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

Longlisted for the PEN/EO Wilson Literary Science Writing Award “Every new book by Frans
de Waal is a cause for excitement, and this one is no different. A breath of fresh air in the …

Human adolescence is characterized by a suite of changes in decision-making and
emotional regulation that promote risky and impulsive behavior. Accumulating evidence …

Evolutionary theories predict that sibling relationships will reflect a complex balance of
cooperative and competitive dynamics. In most mammals, dispersal and death patterns …

Group‐living animals often maintain a few very close affiliative relationships—social bonds—
that can buffer them against many of the inevitable costs of gregariousness. Kinship plays a …

Individuals of social species experience competitive costs and social benefits of group living.
Substantial flexibility in humans' social structure and the combination of different types of …