The coevolutionary interactions between avian brood parasites and their hosts provide a
powerful system for investigating the diversity of animal coloration. Specifically, reciprocal …

Biliverdin and protoporphyrin pigments are deposited into the eggshell when the developing
egg is in the shell gland. However, the site of synthesis of eggshell pigments is still …

Avian eggshell color seems to fulfill multiple functions, some of them being structural and
others signaling. In this study, we tested whether or not eggshell coloration may play a role …

Capsule: Long-term changes in eggshell speckling correlated temporally and spatially with
declining soil calcium in an English Great Tit Parus major population. Aims: Eggshell …

Birds' eggs exhibit a small amount of interspecific diversity in terms of their colors and
patterning but considerable variation occurs at the intraspecific level. Here, we examined the …

Colour traits evolve under the antagonistic selective pressures of increasing detectability to
intended receivers (eg conspecifics) while minimizing detectability to unintended receivers …

Vaquero-Alba and colleagues published a study in The Auk: Ornithological Advances
comparing objective color measurements of plumage taken in the field directly on a bird's …

Offspring across the animal kingdom have evolved a variety of vocalizations, postures and
structural ornaments to help them solicit more food from their parents. These signals are …