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 ...

True blue is one of nature's rarest tricks, and the animals that pull it off range from tiny ocean drifters that steal venom ...

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 ...

What if the color blue in nature isn’t really blue at all? It sounds impossible. Because when you see a bright blue animal, it feels magical almost unreal. But here’s the surprising truth: most blue ...