My husband had a Red Shouldered hawk come at him one time after he repeatedly interrupted his hunting. It was hunting some wild day old duckies on our pond and my husband shoed them to safety. The hawk got ****** and came right at him, grazing the top of his head.
It looks like turkey vultures. They gather in large groups like that. They have an incredible sense of smell. We had four of them circling our yard over a dead rat my husband had shot. They just came out of nowhere.