Can't always judge a bear by it's reputation

Ninety percent of the Grizzly Bear's food comes from plants. The reason they hibernate in the winter is because they aren't great hunters and their digestive systems would struggle to survive on low nutritional winter plants. It would take more energy to catch occasional prey and absorb nourishment from nutritionally void plant matter than what they would gain from them. So they gorge and store in the summer and sleep and conserve in the winter.