Most are distinguished by striking colors and bright plumage of yellow, blue, scarlet, and green. These colors distinguish them as some of the world's most dramatic and attractive birds.

It is common in invertebrates, reptiles, amphibians, fish, and even birds. Platypusses glow blue-green, some flying squirrels glow pink, puffins beaks glow pink and white under UV light and a ...

they believed that nearly the entire green region you see here controlled only instinctual behavior. Thus, the bird's brain was thought to be nearly all instinct driven. The dark and light blue ...