This process is called hibernation. It is particularly common in small mammals like mice, hedgehogs and bats. Larger animals ...

Researchers found animals that slept together exhibited increased attraction and moved in cohesive formations for up to three ...

Animals can sleep on the wing, standing up, sitting in a tree or diving in the ocean. Many don't close their eyes, and some don't even have eyelids. Here are some of the strangest ways to snooze.