I saw a doco a few years back were a guy was hang gliding in the mountains in the US somewhere, and a Bald Eagle came and flew close formation with him for a bit before actually 'landing' on the very front part of the hang glider, with his wings spread, and flew along with the guy for ages.
Was an awesome sight, I can only imagine how cool an experience it was for the bloke in the hang glider.
He was a native American and was quite obviously deeply moved by his contact and time shared with what he called his ancestor.
Was a very cool show.