MassWildlife biologists visit black bear dens every winter to collect valuable data.
Black Bears
DNR Asks Public to Report Bear Dens This Winter
Interesting facts about winter-time black bears
Researchers investigating movement of black bears into new
Protections needed for bear hibernation dens: Cowichan expert
NJDEP, Fish & Wildlife
Searching for Food
If you see a bear den this winter, the DNR wants to know
Black Bears - Bears (U.S. National Park Service)