Eggs evolved color and speckles only once — during the age of dinosaurs

Analysis of pigmentation in the eggs of modern birds and nonavian dinosaurs suggests similarities

a photo of a large gray fossilized egg along with modern day eggs of different hues

MOTTLED CREW  Colorful eggshells were a trait shared not only by ancient and modern birds, but also by their theropod dinosaur ancestors (as seen in the large fossilized egg at right). 

J. Wiemann/Yale Univ.

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