So, it makes a lot of sense for birds to change color in response. In the study, researchers drew information from over 1200 bird species, showing how urbanization changes feather colors.

Now, research has revealed these stunning birds are also sending secret color signals that are invisible to human eyes.

In some animals, the same species can occur in two or more color types, or morphs. New research may help solve the mystery of how this can occur despite the pressures of evolution. In some animals ...

Birds have additional color cones in their retina that are sensitive to ultraviolet range so they see colors that are invisible to humans. Over time, birds have evolved a dazzling combination of ...

The birds are known for their rich, deep blue hues. Photograph By CAGAN H. SEKERCIOGLU Ridgway's 1912 book, Color Standards and Color Nomenclature, published in was an immediate hit, selling out ...

“Birds cannot synthesize carotenoids,” said ... they’re not going to be able to color their plumage with those pigments,” Dr. Delhey said. Carotenoid deficiency is most likely the reason ...

Researchers described biofluorescence in 37 of the 45 known species of birds-of-paradise, found only in remote tropical forests and woodland habitats of Papua New Guinea, eastern Indonesia and ...