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, ...

Typically, females appear less colorful than males; this adaptation helps protect females from predators. Such an adaptation ...

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 ...

Color is in the eye of the beholder The human eye contains three types of cone cells, photoreceptors that allow us to see blue, green and red ... How a bird sees a butterfly When a male orange ...