Carotenoid pigments underlie most of the red, orange, and yellow visual signals used in
mate choice in vertebrates. However, many of the underlying processes surrounding the …

Seasonally breeding animals often exhibit different social structures during non-breeding
and breeding periods that coincide with seasonal environmental variation and resource …

Sperm competition is thought to impose strong selection on males to produce competitive
ejaculates to outcompete rival males under competitive mating conditions. Our …

During the breeding season, male Red-backed Fairywrens (Malurus melanocephalus) can
exhibit ornamented (red-black) or unornamented (brown, resembling females and juveniles) …

Most seabirds delay reproduction for multiple years. The long-standing ecological
hypothesis is that seabirds delay reproduction until they pass a foraging efficiency threshold …

Ornithologists have long been fascinated by avian hybrids and this interest has increased in
recent years with advances in our understanding of the potential evolutionary consequences …

Sexual selection can drive the evolution of exaggerated ornaments and armaments, which
serve no purpose to survival but are beneficial for mate choice or intrasexual competition …