I've never done it, but when we baited black bears, years ago, my brother did it on his bait site. Of the four hunters he then was the only hunter to actually have ravens fly in and sit on the bait. The rest of us would see ravens fly over like they were interested, but they wouldn't land. So it at least fooled the ravens. He didn't get a bear off that bait, but he switched to my baitafter I'd scored.

Dan