Data from: Are blue eggs a sexually selected signal of female collared flycatchers? A cross-fostering experiment

Miloš Krist & Tomáš Grim
Impressive variation in egg colouration among birds has puzzled evolutionary biologists for a long time. The most frequently studied selective forces moulding egg colouration – predation and brood parasitism – have either received little empirical support or may play a role in only a minority of species. A novel hypothesis has suggested that egg colour may be significantly influenced by sexual selection. Females may deposit a blue-green pigment biliverdin into eggshells instead of using it...
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