Sit back and have a laugh at this round-up of funny squirrel pictures. Also don't miss these nutty facts about squirrels.

Arctic ground squirrels (Urocitellus parryii) are highly vulnerable to climate change but might persist in climate-change refugia in Denali National Park, Alaska. Disclaimer: AAAS and EurekAlert!

There are about 50 species of flying squirrels ranging across most of North America down into Central America, and stretching from Southeast and Northern Asia into Siberia and Scandinavia.

Chipmunks along with groundhogs (also known as woodchucks), marmots, and prairie dogs are all considered ground dwelling squirrels. Take a moment to appreciate our squirrel-related collections images ...

Top photo: A free-ranging squirrel leaps from one branch to a branch instrumented to measure force. (Image credit: Sebastian Lee). Bottom photo: A one-legged robot, called Salto, was modified to ...