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 ...

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.

Lizards, birds and fish often sport vivid colors, from neon pink to deep violet, but most mammals are fairly drab. So why don't mammals match the vibrant hues of other animals? A number of factors ...

New research has revealed that birds, reptiles, and mammals have developed complex brain circuits independently, despite sharing a common ancestor. These findings challenge the traditional view of ...

The earliest reptiles, birds and mammals may have borne live young, researchers have revealed. The earliest reptiles, birds and mammals may have borne live young, researchers from Nanjing University ...

Giant prehistoric insects may not have depended on high oxygen levels after all. Scientists now think something else must explain their massive size. Credit: SciTechDaily.com The true reason ancient ...