Had forgotten about it until I read this, but about 2 years ago I was walking out the door of my cabin in northern Wi and saw a very large shadow on the ground of a large flying bird. Turning around and looking up I expected the creature to be not far above me, according to the size of the shadow. It was quite far in the air, eagle-like but much bigger. Also a grey color. I have seen many eagles up here, not this bird. Looked into a few bird books, nothing like it.