That's with wolves in particular. After the movie "White Fang" it says that there has never been documentation of a healthy wolf or wolf pack attacking a human in the N. American continent. Ever. Not one. That's a pretty bold statement if false.
Now sick, starving, old and broken teeth, turned onto human food --all bets off. But again, that's not a healthy animal in the wild anymore.
I've been literally feet from coyotes in the wild and the not so wild many, many times and not once has one ever attacked, growled or otherwise showed hostile intent. If anything they skit off if you come too close.
The ground squirrels on Mt. Rainier are much braver, they'll get behind a small rock or a can and have a stand off with you.