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Hi there. I have been birding most of my life and am currently a grad student working on a bird migration study. "A bird does not sing because it has an answer. It sings because it has a song."
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ScienceDaily (May 14, 2012) — A male robin will be more diligent in caring for its young if the eggs its mate lays are a brighter shade of blue. The blue colour in robin eggs is due to biliverdin, a pigment deposited on the eggshell when the female lays the eggs. There is some evidence that higher biliverdin levels indicate a healthier female and brighter blue eggs. Eggs laid by a healthier female seemed to encourage males to take more interest in their young. (via Color of robins’ eggs determines parental care)

ScienceDaily (May 14, 2012) — A male robin will be more diligent in caring for its young if the eggs its mate lays are a brighter shade of blue.

The blue colour in robin eggs is due to biliverdin, a pigment deposited on the eggshell when the female lays the eggs. There is some evidence that higher biliverdin levels indicate a healthier female and brighter blue eggs. Eggs laid by a healthier female seemed to encourage males to take more interest in their young.

(via Color of robins’ eggs determines parental care)

Filed under: science, biology, birds, parental care, cues, ornithology, behavior,
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