Birds show bewildering diversity in their life histories, mating systems and risk of extinction.
Why do albatrosses delay reproduction for the first 12 years of their life while zebra finches …

The purpose of this study was to document patterns of reproductive skew among male
spotted hyenas (Crocuta crocuta), a species in which many normal mammalian sex roles are …

After the discovery of eusociality in the naked mole–rat, it was proposed that inbreeding and
high colony relatedness in this species were the major underlying factors driving …

Who reproduces in colonies of social insects is determined by some combination of direct
competition and more peaceful convention. We studied these two alternatives in …

Evolutionary biologists have grappled with the question of the emergenceand maintenance
of cooperation since Darwin first listed animal cooperation asapotential problem for his …

Current research on the evolution of sociality seeks to integrate a wealth of species‐specific
studies to draw more generalized conclusions. Developing a unified theory of social …

Two current models seek to explain reproduction of subordinates in social groups:
incentives given by dominants for peacefully remaining in the group (reproductive skew …

A plethora of recent models examines how genetic and environmental factors might
influence partitioning of reproduction ('skew') in animal societies, but empirical data are …

Reproductive skew models, which focus on the degree to which reproduction is shared
equally (low skew) or monopolized by a single individual (high skew) within groups, have …

In cooperatively breeding birds multiple maternity and paternity of broods is not uncommon,
reproduction often being shared among group members as well as with extragroup …