Add this to the list of things I never really thought about. What do wild cats think of our man-made hunting decoys?

I'm not a hunter so this isn't something I've ever concerned myself with. I do know that I've seen a lot of decoys that don't really look much like their animal representations though. In this video caught by an Idaho hunter a young mountain lion is seen approaching a deer decoy and then just seems confused as he sniffs the mock animal.

Have you ever seen this when you go hunting? Does the same thing happen with bird decoys?