Unlike birds whose plumage is mostly blue, the green coloring of a green bird’s feathers is primarily a combination of pigment and structure, not just a trick of the light. These birds’ emerald green, ...

Animals range in size, shape, and appearance. Some possess drab, plain-looking feathers, scales, or skin, while others sport ...

But birds have four color cones, meaning they are tetrachromatic. With our three color cones, we can see the colors of the rainbow—red, orange, yellow, green, blue, indigo, and violet—the so ...

In addition to blue, green and red cone cells, many birds have cone cells that are sensitive to ultraviolet light, ... To humans, the wings would appear to be orange, yellow and black. Credit ...