In 26 seasons in a tree with a bow I've only ever seen 2.

The first was only moments as it stepped onto and off a log down in the woods. The second was 3 years ago, the same evening I shot my contest buck in 04. A bobcat was mousing in the field when the buck came to my calls and eyeballed the bobcat. He didn't seem too concerned over the cat nor did the cat pay any attention to the buck.