Ahaa! Treadwell is a great example for leaving the wildlife to be wildlife unless you want to be a meal...
There are a few other interesting facts about grizzles. In Alaska, their diet is limited to fish, mostly salmon which are easy to catch. In the Continental US, they prefer fruits and vegetable, as well as fish. They are not predators, except on absentee fathers and their bastardized children. They do not eat this prey themselves, they leave that to wolves who co-exist in their habit.
In general, grizzlies bear no malice against other animals, including humans, except those who may have tried to injure them in the past - they are very intelligent and have excellent memories.
(Source: Montana FWP Grizzly and Wolves Habitat; Pocatello ID Zoo, and others)