Rodents

Nearly 40% of mammal species are rodents, and they are found on every continent except Antarctica. Rodents include mice, rats, squirrels, chipmunks and beavers, among others.

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White-Footed Mouse

This common nocturnal mouse is often seen climbing in trees, using its long tail for balance.


Rats Are Little Geniuses

Despite our best efforts at eradicating them, rats keep outsmarting us. Here's how.

Naked Mole Rats Survive Without Oxygen by Turning Into Plants

Deprived of oxygen, naked mole rats can alter their metabolic functions to something less mammalian and more plantlike, burning fructose instead of glucose.

These Arctic Squirrels Repeat Puberty Every Year of Their Lives

It's like the movie "Groundhog Day" every April, but with hibernation, a smaller rodent and way more hormones.

5 Things You Didn't Know About Squirrels

If you look outside your window right now, you'll probably see one running up a tree or checking you out. How did the squirrel get so commonplace?

Madagascar's Most Famous Species Is Near Extinction

Ring-tailed lemurs — perhaps the most iconic species on the tropical island of Madagascar — are in significant decline due to habitat loss, hunting and illegal capture.

Rats Are Ticklish Just Like Humans, New Study Shows

They're dirty, hairy, mangy-looking creatures — and they giggle and squirm when tickled, just like us.

Goodbye, Melomys: Climate Change Claims Its First Mammal Species

Rising sea levels wiped out the entire population of a rodent species only found on remote Australian island Bramble Cay. Who's next?

To Save the Galapagos Islands, We May Need to Modify Rat DNA

The population-control strategy to rid the islands of the invasive species would use something called "gene driving" and GMO rodents.

Prairie Dogs Savagely Kill Squirrels to Eliminate the Competition

Prairie dogs are cute little vegetarians … who have no problem casually snapping the neck of a ground squirrel. And those that kill have another sexy benefit, too.

'Off Switch' for Appetite Accidentally Discovered in Brain Enzyme

Researchers at Johns Hopkins have stumbled upon a previously unknown type of brain cell that tells mice when to stop eating. Could that work for humans?