Learn to identify bird eggs and discover how egg color ... Clutch size: 3 to 4 eggs The spotless, bright blue-green eggs in the American robin’s mud-lined nest are a sure sign that spring ...

Birds have evolved to fit particular environments. Eggs have evolved along with the birds. The eggs that birds will lay this spring will vary in shape and color to facilitate successful hatching ...

People have always wondered why many birds lay bright blue eggs. David Lahti of the City University of New York and Dan Ardia of Franklin & Marshall College tested the hypothesis that pigmentation ...

For more than a century, scientists were bedeviled by this mystery, but the researchers have managed to identify an ... hypothesize that birds who evolved to lay blue eggs did so to protect ...

While you might be most familiar with “robin’s egg blue”, many species of birds lay blue-colored eggs. Why might this have evolved? Although scientists can’t go back in time to observe the emergence ...

Mockingbird eggs can be a pretty blue, too, but lighter and with brown speckles. Your general question, however, remains the same — is it common for birds to share nest duties, and the answer is ...

While you might be most familiar with "robin's egg blue", many species of birds lay blue-colored eggs. Why might this have evolved? Although scientists can't go back in time to observe the emergence ...