I watched one take a fall last night. I could feel him in my tree, I looked up and there he was...10 feet above my head. I watched him as he went out to the end of a rather large branch as he contemplated making the leap to a neighboring tree about 12 feet away. He went for it. When he grabbed the branch in mid flight the branch bent under his weight and down he went. He bounced off of about 3 branches on his way down. Then THUMP! He sat there stunned for a minute and then went on about his business. I couldn't help but laugh at that one.