Women and girls cooperate with each other across many domains and at many scales.
However, much of this information is buried in the ethnographic record and has been …

Here I review recent research on reproductive conflict between females in families and how
it influences their reproductive behaviour. Kin selection can favor cooperation between …

This paper introduces a Theme Issue combining interdisciplinary perspectives in the study of
female competition and aggression. Despite a history of being largely overlooked, evidence …

Behavioral genetics and cultural evolution have both revolutionized our understanding of
human behavior–largely independent of each other. Here, we reconcile these two fields …

Why females of some species cease ovulation prior to the end of their natural lifespan is a
long-standing evolutionary puzzle [1–4]. The fitness benefits of post-reproductive helping …

Inequality between the sexes is pervasive both outside and inside the home. One
contributing factor could be the dispersal of one sex at marriage that sets up sex-specific …

Why parents in some societies induce some of their sons to become religious celibates is an
evolutionary puzzle. Some have speculated that this might be associated with brother …

Previous research argues that female choice may not be as powerful an influence on the
evolution of human mating preferences as once expected given the importance of parental …

Mammal social groups vary considerably in size from single individuals to very large herds.
In some taxa, these groups are extremely stable, with at least some individuals being …

Objectives This study provides an evolutionary perspective to a classic topic in demography,
that is, the discrepancy between reproductive intention and subsequent behavior, in the …