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

Dinosaur 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 ...

Bird eggs sport an amazing variety of sizes, colors, and shapes. Their colors could fill an artist’s palette, from robin's ...

Birds are descended from egg-laying dinosaurs, and before you ask that age-old question, the egg came first. It was very different from eggs we are familiar with these days.