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 ...

Amazon mollies don't need a man, and never will. A new study finds they can purge and repair genetic mutations that would otherwise plague a self-cloning species.

Emperor cichlids, large fish native to Lake Tanganyika in Africa, don't like being stared at, especially if someone's gaze is directed at their offspring. Those are the findings of a new study ...

A new study found that subtle differences in an animal’s behavior by midlife can predict how long it is likely to live.