Egg colour reflects the amount of yolk maternal antibodies and fledging success in a songbird.

@article{Morales2006EggCR,
  title={Egg colour reflects the amount of yolk maternal antibodies and fledging success in a songbird.},
  author={Judith F Morales and Juan Jos{\'e} Sanz and Juan Moreno},
  journal={Biology letters},
  year={2006},
  volume={2 3},
  pages={334-6}
}
Blue-green colours in avian eggs have been proposed as post-mating signals of female phenotypic quality to their mates. Egg colour may not only indicate female value, but also the quality of the eggs themselves and of resulting offspring. To date, there has been no demonstration of an association between egg colour and egg or offspring immune quality. We here show that the intensity of blue-green colour of pied flycatcher Ficedula hypoleuca eggs reflects the amount of maternal antibodies in the… CONTINUE READING