The first comprehensive review of all aspects of the biology of moult, drawing information
from across the literature and in all birds, from penguins to passerines. Feathers are …

Plumage ornaments act as important sexual signals, though the extent to which these
ornaments act as honest signals—and the physiological mechanisms that maintain honesty …

Birds often face various stressors during feather renewing, for example, enduring infection
with blood parasites. Because nutritional resources are typically limited, especially for wild …

On the subtropical and tropical wintering grounds of migratory birds, variation in moisture
levels and habitat can influence the availability of food resources and subsequently impact …

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 …

Feathers have a diversity of functions in birds and are costly to produce, so their growth rate
and mass can be reliable indicators of nutritional condition at the time of production. Despite …

Plumage and song are important signals used by birds to attract mates and repel rivals.
Divergence in sexual signals can lead to reproductive isolation among incipient species, but …

Conspicuous colors may signal individual quality if high-quality individuals produce more
elaborate colors or have a greater capacity to invest in color maintenance. We investigate …

Bird species often use flight calls to engage in social behavior, for instance maintain group
cohesion and to signal individual identity, kin or social associations, or breeding status of the …

Abstract Knowledge of the genetic basis of sexual ornaments is essential to understand their
evolution through sexual selection. Although carotenoid‐based ornaments have been …