Let us go back to 1980. This was the year a very peculiar creature was reported from Wisconsin. It has been called a Birdman and that is perhaps the only designation which is appropriate. It was humanoid, it had arms and legs and the bird part consisted of a beak and birdlike feet. Its height was estimated at 6 feet.
My guess is tyhat it was a large and somewhat misperceived bird. There was only a single witness.