This comprehensive introductory text integrates evolutionary, ecological, and demographic
perspectives with new results from field studies and contemporary noninvasive molecular …

Like catarrhines, some platyrrhines show exposed and reddish skin, raising the possibility
that reddish signals have evolved convergently. This variation in skin exposure and color …

Males must partition their limited reproductive investments between traits that promote
access to females (sexual ornaments and weapons) and traits that enhance fertilization …

Exaggerated male traits can evolve under intra-or intersexual selection, but it remains less
clear how often both mechanisms act together on trait evolution. While the males of many …

Primates are remarkably colourful in comparison to other mammals. In particular, several
species exhibit red–orange pelage or bright red skin, with the latter thought to signal status …

Male proboscis monkeys have uniquely enlarged noses that are prominent adornments,
which may have evolved through their sexually competitive harem group social system …

Males in many vertebrate species have colorful ornaments that evolved by sexual selection.
The role of androgens in the genesis and maintenance of these signals is unclear. We …

Sexual selection favours traits that increase reproductive success via increased competitive
ability, attractiveness, or both. Male rhesus macaque (Macaca mulatta) morphological traits …

In many primate species that form one‐male breeding units (OMUs), the threat of a takeover
by a bachelor male represents a major challenge to group stability and individual …

Objective Sexual selection theory provides a framework through which some facial displays
of male non-human primates can be investigated and understood. Here, we explore how …