Among vertebrates, fish show by far the greatest variability of alternative reproductive tactics
(ARTs). Usually, males attempting to monopolize access to females or fertilizations are …

Recent studies have uncovered remarkable variation in paternity within primate groups. To
date, however, we lack a general understanding of the factors that drive variation in paternity …

Identifying traits that affect the reproductive success of individuals is fundamental for our
understanding of evolutionary processes. In cooperative breeders, a dominant male typically …

In animal societies, contrasts in reproductive skew among females are caused by variation
in the frequency of reproduction by subordinates. However, despite widespread interest in …

Abstract The primates of Madagascar (Lemuriformes) are unusual among mammals in that
polygynous species lack sexual dimorphism, and females dominate males socially in most …

We review the historical development of theory on the evolution and ecology of cooperation.
Darwin launched this topic of inquiry with a surprisingly modern discussion of how fitness …

Reproductive skew is a measure of the proportion of individuals of each sex that breed in a
group and is a valuable measure for understanding the evolution and maintenance of …

In group-living animals, dominants may suppress subordinate reproduction directly and
indirectly, thereby skewing reproduction in their favour. In this study, we show experimentally …

Proximate mechanisms underlying reproductive skew are obscure in many animals that
breed communally. Here, we address causes of reproductive skew in brood-parasitic …

The social organization of gregarious lemurs significantly deviates from predictions of the
socioecological model, as they form small groups in which the number of males …