Wow. Grizzlys are the pit bulls of bears.
Nice video. And from the people with whom I've talked and what I've read, grizzlys, like pit bulls, are docile most of the time if you don't mess with them, and like pit bulls can attack without provovation or warning.
I wouldn't hike around them without a .44 Magnum close to hand. And I doubt if I'd hike alone around them. Just too big, mean and unpredictable.
Arf