Birds have evolved to fit particular ... Red-winged blackbirds lay pale blue-green to gray eggs with black or brown markings in their marsh nests. Other local nesters with some blue-tinted eggs ...

Some animals lay beautiful green, brown, and even pink eggs. Considered to be one of the most attractive are the blue eggs ...

like bird eggs today, get their colors and speckles from various combinations of those two molecules. Biliverdin is the source of blue/green and protoporphyrin provides the rusts and browns.

Depending upon the breed, some are even blue and green ... due to bird flu, then that can raise prices. Looking specifically at the economics of producing brown eggs versus conventional ...

A bird once declared extinct in the wild has just laid eggs ... blue wings, and a sharp beak. Native to the island of Guam, the tiny birds thrived until the accidental introduction of the brown ...