Red blood is the exception, not the rule. Evolution has painted it green, purple and white in animals that push physiology ...

Nature’s natural colors can be breathtaking. Tropical birds are famous for their brightly colored feathers, and many fish species are dazzling. There are gorgeous insects that look like they’re ...

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 going for them besides ...

YELLOWSTONE NATIONAL PARK, Wyo. — Photos of a white bison calf in Yellowstone National Park have generated excitement as well as questions: How does that happen? A park visitor said she took the ...

Beneath sea urchins’ exterior spines, rounded skeletons called tests are jewels of color, texture, and symmetry. There are hundreds of urchin species, and they’re found in every ocean on Earth, from ...