The color vision of birds stops working considerably earlier in the course of the day than was previously believed, in fact, in the twilight. Birds need between 5 and 20 times as much light as ...

The birds were better at recognizing subtle differences within each color category, but less prone to treat colors from opposite sides of the boundary as "either/or" compared to the red-orange range.

From baby blue to black-speckled beige, bird eggs are as varied as the species that lay them. Why bird eggs come in so many colors is still something of a mystery, but new research identifies a reason ...

In both studies, the birds were better at distinguishing some color pairs than others, even when those pairs were equally far apart on the color spectrum. By analyzing where these shifts in ...

We ran this same analysis for all 559 bird species, resulting in a rainbow of colors representing U.S. birds.

But the colors can be a liability for the caterpillar when young birds are learning what to eat, a study suggests. Kimmo Silvonen By Susan Milius September 25, 2014 at 9:58 am ...

Birds Camouflage Nests Using Matching ColorsIn a neat experiment on bird interior design, researchers show that finches conceal their nests by deliberately choosing construction materials that ...

Metabolizing the pigments requires physiological processes that a bird can’t fudge. To put the pigments to use, birds “have to be healthy at a cellular level,” Dr. Hill said.