Sexual selection arises from competition among individuals for access to mates, resulting in
the evolution of conspicuous sexually selected traits, especially when inter‐sexual …

Abstract Barn Swallows (Hirundo rustica), a group of passerine birds comprised of six
closely related subspecies, are well known throughout their nearly worldwide distribution, in …

Climate change, habitat alteration, range expansions, and biological invasions are all
predicted to require rapid shifts in multiple traits including behavior and life history, both for …

Complex signals, involving multiple components within and across modalities, are common
in animal communication. However, decomposing complex signals into traits and their …

Melanin is the main pigment in animal coloration and considerable variation in the
concentrations of the two melanin forms (pheo-and eumlanin) in pigmented tissues exists …

The steroid hormone testosterone (T) is a well-known mediator of male sexual behavior in
vertebrates. However, less is known about T's rapid effects on sexual behavior, particularly …

Understanding the patterns and processes related to sexual dimorphism and sex differences
in diverse animal taxa is a foundational research topic in ecology and evolution. Within the …

Phaeomelanin is a common pigment that confers a reddish colour to animals. Since
phaeomelanogenesis requires the sulfhydryl group from cysteine or glutathione (GSH) …

Natural and sexual selection arise when individual fitness varies according to focal traits.
Extra-pair paternities (EPPs) can affect the intensity of selection by influencing variance in …

The European barn swallow, Hirundo rustica rustica, is a model system of female mate
choice for indirect benefits. Its long tail, which is the target of female mate choice, is …