Q. You once wrote that blue pigment is not known to exist in any terrestrial or freshwater animals with backbones. I found a blue bullfrog in a marsh in Virginia. It was mostly blue with some gray ...

Animals come in all sorts of colors, and while the animal kingdom has most of the rainbow’s colors at its disposal, there are a few exceptions. Some animals, for example, may appear blue at first ...

In a remote part of Australia, researchers recently stumbled upon an unusual, blue-skinned tree frog. This individual is a rare genetic mutant of the magnificent tree frog, a large amphibian that’s ...