I've observed Grand Canyon South Rim is a great example. They actively work the tourists who make hand-to-mouth gestures and steal when items are unguarded. The

I've observed Grand Canyon South Rim is a great example. They actively work the tourists who make hand-to-mouth gestures and steal when items are unguarded. Their team strategizing while hacking bear-proof garbage cans is impressive, too. One handles the door/partition while one or more enters for the snacks. I spent 1/2 a day watching them.