Williams recognized the extremely rare bilateral color variation, a mutation he had previously read about in lobsters and observed in an American redstart bird. The class brought the crayfish back to ...

Pink is not a common colour in the natural world, which makes pink animals especially striking. Their unique hues come from diet, genetics, and sometimes rare mutations. In some cultures, these ...

While green isn’t an unusual color in nature, beautiful green animals are somewhat rare and exotic. Many green-colored animals, such as toads and various insects, have little to distinguish them ...