How does a polar bear stay warm? Wear a "Blubber Glove" and slip your covered hand into ice water. Here are the directions: http://whale.wheelock.edu/whalenet-stuff/Blubberglove.html
Journal observations while we view the den cam at http://www.bear.org/livecams/lily-faith-cam.php. As kindergarten scientists, we talk about drawing and writing what we observe with our scientist eyes. The most important fact my students learned about hibernating bears is that there are many periods of activity in the den.
How big is your paw? Compare your foot/hand with a typical black bear paw print replicated on brown craft paper. Trace your foot/hand inside it.
Here are more black bear lesson plans from bear.org: