Years ago about dawn felt a "whoosh" by my neck in a tree stand. It was a great horned owl mistaking my ponytail (back then) for an animal. He just missed grabbing my neck, roosted in a tree nearby and looked at me for about 20 minutes trying to see if I was edible. I was really glad he veered off.
Found a porcupine in a ground blind one AM, he would not leave. Tried to sit him out, no change. So finally I started hurling sticks at him, he squeezed out a hole no bigger than my fist.
Last year an opossum repeatedly tried to enter a ground blind I was occupying, like the porky he probably had been nesting there.
It's funny, I hunt where there are lots of bears, timber wolves and grouse. Now it sounds like I'd better keep an eye on the grouse!