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 …

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 …

We evaluated the feasibility and efficiency of using swabs to collect buccal epithelial cells
from small (2‐to 13‐g) birds as a source of DNA for genetic studies. We used commercially …

Females of many socially monogamous bird species commonly engage in extra-pair
copulations. Assuming that extra-pair males are more attractive than the females' social …

Females mated to attractive males are predicted to produce male-biased broods. Previous
studies on zebra finches, Taeniopygia guttata, in which colored leg rings were used to alter …

Evolutionary theory suggests that natural selection should favor the ability of animals to
modify their offspring sex ratios when the fitness benefits of producing one sex over the other …

A reintroduction project for the endangered Crested Ibis Nipponia nippon was conducted in
Ningshan County (Shaanxi Province) on May 31, 2007. Post-release monitoring of the …

In species with extrapair mating, females may choose a social mate who will contribute to
the successful raising of their brood and a sire who can enhance the genetic quality of …

Offspring sex-ratio is a key life-history trait that shows considerable variation among many
bird species. Habitat quality is one of the numerous environmental factors acting on bias in …