A bird once declared extinct in the wild has just laid eggs in Hawaii. The sihek vanished by the 1980s after the accidental introduction of a snake.

Of all the vertebrates on Earth – that is, animals with backbones – birds are the only ones that lay colourful eggs. Scientists are still unsure why, but new research brings us a step closer ...

Robins aren't the only layers of blue eggs. Eastern bluebirds may lay light blue or whitish eggs. Blue jay eggs are pale green-blue with dark spots. House finches lay eggs that are bluish-green ...

Development of the egg While it may sometimes seem odd that chickens lay eggs, it’s really not odd at all. Chickens are birds and all birds reproduce by laying eggs.

Published: October 28, 2019 3:05pm EDT Birds lay eggs with a huge variety of colours and patterns, from immaculate white to a range of blue-greens and reddish browns.

Rising night-time temperatures are causing woodland birds to build nests and lay eggs earlier in springtime, research shows.

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 ...

Blue and green egg hues are found in eggs belonging to many types of modern birds, and were long thought to have originated in bird lineages.

Shedding Light on Bird Egg Color: Pigment as Parasol and the Dark Car Effect “The vibrant colors of many birds’ eggs, particularly those that are blue to blue-green, are extraordinary in that they are ...

The answer behind why birds lay blue eggs lie in the sun's varying effects, including its harmful ultraviolet radiation. A light blue tint, for instance, allows the eggs to warm without overheating.

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 ...