Most mammals wear coats of brown, black, and gray, while parrots flash brilliant reds, reef fish shimmer in electric blue, and chameleons shift between greens and golds. This disparity is not random.

Many mammals have fur the color of brown and black. Why don't they have more exotic colors, like purple and neon pink?

Why did our ancestors ditch the shell and start growing babies inside their bodies instead? In this episode of Big Ideas, ...

In the past, many scientists believed that only mammals and birds could feel or think in complex ways. Reptiles, fish, and insects were seen as simple creatures that reacted purely on instinct. But ...

The basic decision-making circuitry underlying social behaviors such as fighting and mating is incredibly similar in all vertebrates, from fish to mammals, new research suggests. These networks may be ...

Notes on reptiles, amphibians, fish, and small mammals collected in Fort Custer and Bighorn River in Montana. Bendire collected from 23 September 1884 to 1 July 1885. Tag numbers include 604 to 650.