Offspring sex ratios in wild bird populations, and the extent to which they vary from the
equality expected by random genotypic sex determination, have received much recent …

Females can benefit from mate choice for male traits (eg sexual ornaments or body
condition) that reliably signal the effect that mating will have on mean offspring fitness …

Historical scenarios of evolution of avian plumage coloration have been called into question
with the discoveries that most birds can see UV light (which normal humans cannot), and …

It is poorly understood whether female morphological and behavioural traits can be used as
'signals'. In particular, experimental tests of the hypothesis that female ornaments reflect …

Some bird species would be able to manipulate primary sex ratio, ie the proportion of male
and female offspring at the laying time. Such trait could be considered being mostly under …

The great diversity of sex determination mechanisms in animals and plants ranges from
genetic sex determination (GSD, eg mammals, birds, and most dioecious plants) to …

In animal vocal communication, the development of adult-like vocalization is fundamental to
interact appropriately with conspecifics. However, the factors that guide ontogenetic …

The differential allocation hypothesis predicts that parents should adjust their current
investment in relation to perceived mate attractiveness if this affects offspring fitness. It …

Plumage coloration is generally perceived as a static trait and therefore not a good indicator
of current condition. However, changing of feather colors after molt does occur and may …

Despite the importance of proximate mechanisms for understanding costs and functions of
signals, relatively little is known about physiological processes underlying colorful plumage …