These breathtaking animals are all naturally purple, a rare color found in wild fauna. Read about what makes them so special.

The purple martin is the largest swallow in North America. Males are all dark, glossy blue-black; females and immatures duller above and grayish below. The purple martin is an extremely popular ...

Blood is often associated with the color red, but in the animal kingdom, it comes in a surprising range of hues. From the ...