Abstract Theory suggests that overcrowding and increased competition in urban
environments might be detrimental to individual condition in avian populations …

Although sexual ornamentation mediates reproductive isolation, comparative evidence does
not support the hypothesis that stronger sexual selection promotes speciation. Prior …

Sexual traits (eg visual ornaments, acoustic signals, courtship behaviour) are often
displayed together as multimodal signals. Some hypotheses predict joint evolution of …

Given the known influence of parental investment on breeding success of great tits Parus
major, females should be expected to use male parental quality as an essential criterion in …

Carotenoid-based coloration in adult birds has been often regarded as an honest signal of
individual quality. However, few studies have demonstrated a link between carotenoid …

Birds that arrive and breed early often have higher reproductive success than late
individuals, either as a consequence of timing‐specific advantages (the timing hypothesis) …

Parental attractiveness influences paternal and maternal efforts in a wide range of animals
that exhibit biparental care. However, we still lack an understanding concerning the direction …

Carotenoid-based colouration plays an important role in sexual signaling in animals as an
honest indicator of individual quality during mate choice and competitive interactions …

In many avian species, a male's colorful feather ornaments are known to signal individual
quality and can serve as the basis for mate choice. Fewer studies have assessed whether …

The immense diversity of plumage coloration exhibited by birds is the result of either
pigments deposited in the feathers or microstructural arrangements of feather barbules …