These gorgeous, long-tailed marine creatures—formerly known as Siamese fighting fish—have been famous for centuries for their aggressive nature, which breeders have exploited in order to fight them, ...

Species are fizzling out of existence at a rate faster than any other time in human history—and no one is more aware of that fact than National Geographic photographer Joel Sartore. After 13 years of ...

Animals are living color. Wasps buzz with painted warnings. Birds shimmer their iridescent desires. Fish hide from predators with body colors that dapple like light across a rippling pond. And all ...

In nature, the ability to change color can be key to survival. Vision is a very important sense in much of the animal kingdom, and many animals have come up with unique ways to use this sense to ...