During the latter half of the last century, evidence of reproductive competition between males
and male selection by females led to the development of a stereotypical view of sex …

In cooperatively breeding vertebrates, nonbreeding helpers raise young produced by
dominant breeders. Although the evolution of cooperative breeding has often been …

Somewhere in Africa, more than a million years ago, a line of apes began to rear their young
differently than their Great Ape ancestors. From this new form of care came new ways of …

Following Darwin's original insights regarding sexual selection, studies of intrasexual
competition have mainly focused on male competition for mates; by contrast, female …

Darwin developed the theory of sexual selection to account for the evolution of weaponry,
ornamentation and other secondary sexual characters that are commonly more developed …

Comparative studies of social insects and birds show that the evolution of cooperative and
eusocial breeding systems has been confined to species where females mate completely or …

Animal Traditions maintains that the assumption that the selection of genes supplies both a
sufficient explanation of the evolution and a true description of its course is, despite its …

For sexual selection to act on a given sex, there must exist variation in the reproductive
success of that sex as a result of differential access to mates or fertilisations. The …

In most social mammals, some females disperse from their natal group while others remain
and breed there throughout their lives but, in a few, females typically disperse after …

Male mammals often kill conspecific offspring. The benefits of such infanticide to males, and
its costs to females, probably vary across mammalian social and mating systems. We used …