My ultra-liberal dad shot a flying squirrel in his kitchen. With a rifle. He also shot through the cheese board behind the squirrel. And the wall behind that. We had to have a discussion about discharging firearms inside the house. :glare:
Squirrels aren't endangered, though. If they were, he would have called a game warden one of the multiple times it chewed its way in. Of course, squirrels don't pose any grave danger, either, so I'd say that's a toss-up.
There are bears, too, but they're black bears. I don't find black bears threatening, but I'm aware of their nature. If there was a grizzly in my yard, I'd feel much differently.