I saw one in Missouri in the mid-60s. Scared it up from a rabbit it was eating. There was rabbit fur everywhere.
Saturday, I was driving in the country south of Blue Springs (a Kansas City suburb for those who don't know) and I would have sworn that a snowy owl flew past the car. I saw it for about 10 seconds - my son, unfortunately, didn't see it before it flew out of sight, so I have no confirmation on this. It was a large raptor-type bird, predominately white with just a little black or grey on its wings. I couldn't think of anything it could have been since I'm sure it was an owl. I'm 95+% sure that's what I saw but I'm not going to try to convince anyone. I'll assure you that I've been an outdoorsman for 50+ years and I don't have a history of seeing spooks.