Many spectacular cases of biological diversity are associated with sexual selection, and
structures under sexual selection often show positive static allometry: they are …

Sexual selection has the potential to decrease mean fitness in a population through an array
of costs to nonsexual fitness. These costs may be offset when sexual selection favors …

One of the earliest recognized forms of sexual conflict was infanticide by males, which
imposes serious costs on female reproductive success. Here I review two bodies of …

Queen pheromones, which signal the presence of a fertile queen and induce daughter
workers to remain sterile, are considered to play a key role in regulating the reproductive …

Recently, several authors have challenged the view that anisogamy, the defining feature of
the sexes, is an important determinant of the evolution of sex roles. Sex roles are instead …

Socially monogamous birds have provided a major focus of research in the field of sexual
selection, providing insight into the evolution of ornaments, sexual dimorphism and sex …

This paper introduces a Theme Issue presenting the latest developments in research on the
interplay between flexibility and constraint in social behaviour, using comparative datasets …

Identification of genes involved in reproductive isolation opens novel ways to investigate
links between stages of the speciation process. Are the genes coding for ecological …

In one of his few major oversights, Darwin failed to appreciate that male–male competition
and sexual selection can continue even after copulation has begun. The postcopulatory …

Parasitized females in mammals, fish and birds can enhance the immune defence of their
offspring by transferring specific antibodies for the embryo. Likewise, social insect mothers …