Ever noticed how some birds seem to have a stare that cuts ... They also develop a lime green patch from their eyes to their bills. You can’t rely on a Great Egret’s plumage to separate ...

“Finding this beautiful green-yellow glow in birds-of-paradise suggests that there’s even more going on in their elaborate hierarchy and courtship displays than meets the eye,” she adde ...

Now, research has revealed these stunning birds are also sending secret color signals that are invisible to human eyes. Plumage and ... appearing bright green or yellow-green, scientists reported ...