Here's a quick link to a live webcam inside a bear's den. The expectant female bear (Jewel) is hibernating. Black bear births occur in mid to late January. You may only see a lump of black fur breathing away during slumber and hear her deep breaths, but you may tune in to a scratching semi-awake bear.
The North American Bear Center website has amazing articles and facts about this mammal. Stroll around there and learn something new.
...and if you're really lucky, you may be "present" for the upcoming birth!