It's the happiest time of the year — Fat Bear Week! This year's event takes place from Sept. 23-30, and Mashable will be following all the ursine activity. Katmai National Park and Preserve’s brown ...

Add Yahoo as a preferred source to see more of our stories on Google. During hibernation, brown bears spend up to six months lying almost completely still, without eating, drinking or exercising. When ...

During hibernation, brown bears spend up to six months lying almost completely still, without eating, drinking or exercising. When spring arrives, they leave their dens with their muscles largely ...