Two teams of researchers have independently identified a gene-encoded enzyme in birds that converts yellow pigments obtained from the diet into red pigments, which birds then use to color their ...

In the 1300s, Spanish explorers discovered a small bird living in the islands off the western coasts of Portugal and Morocco, with dull green feathers but a sweet lyrical voice. The bird became ...

The American goldfinch is a favorite in the yard area, with its canary yellow body that can often bring flocks of color when they visit feeders. They are common along the Front Range and foothills but ...