Cuckoos are nest parasites, meaning they lay their eggs in other birds' nests. The female cuckoo has to lay eggs that mimic the color, size and shape of the eggs of the host bird. Using a massive ...

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 has arrived in North America­—and sometimes they appear ...

Eggs from these intelligent birds — males can learn up to 200 different songs during their lives — come in a range of speckled pale blue to greenish white. 9. Hummingbird ...

All the colors we see in bird eggs stem from just two pigments, one brown and the other blue. Different concentrations of these two pigments create the vast range of egg colors we see today. Until ...

It’s spring. A female hoopoe—a bird that looks like a pickaxe painted in a tiger’s colours—lays her eggs in a hole within a tree. The eggs come out milky blue, but they soon change colour ...

Why robin eggs are blue Mystery of blue-green bird eggs solved: Researchers show that egg color protects the embryo from harmful sunlight Date: May 27, 2016 ...

Easter Egg. The First Colored Eggs Appeared Long Before Easter The dinosaur ancestors of birds laid blue, brown, and speckled eggs as far back as 150 million years ago.

The eggs laid in northern regions tend to be darker, while eggs get lighter and more blue towards the equator. Global distribution of egg color P.A. Wisocki et al/ Nature Ecology & Evolution 2019 ...

Robin’s egg blue: eggs of the American robin ... Shedding Light on Bird Egg Color: Pigment as Parasol and the Dark Car Effect, The American Naturalist 187(5):547-563 | doi: ...