Happy Hibernations!

Slow, sleepy winter days find many animals curled up in their dens. They sleep warmly through winter, awakening in spring ready to enjoy the renewed Earth. This unusual, deep sleep is called hibernation.

What Is Hibernation?

True hibernation is a very deep sleep. The animal's body temperature drops, its breathing slows, and it is very difficult to awaken. But some animals, such as most bears, do not really hibernate.

How to Clean a Hippopotamus: A Look at Unusual Animal Partnerships

By Steve Jenkins & Robin Page

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Learn about the ingenious lifestyles of some of the world's most unusual animal partners.
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