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Why is a robin’s egg blue? Exploring the evolution of egg colour in birds
A recent hypothesis for explaining blue-green eggs in birds suggests that they may be a sexually selected signal of female (and thus nestling) quality that males use to make parental investment decisions. Although this ...
Delayed maturation of secondary sexual signals in first-year male American redstarts
Male birds of many species use conspicuous song and plumage displays in both courtship and territorial interactions. In some species, one or both of these signalling traits may not reach full adult maturity until a male’s ...