I've seen one of these run once. He cover over 90 metres in what I estimate to be roughly 3 seconds extending his wings to slow down. I saw another one staring at itself in the window of a real estate agent. Perhaps he was looking at property, I'm not sure!!!
The first time I heard that whirring noise, I couldn't work out what it was. Then I realised it was coming from a silly bird carrying on at a ground level window it could see its own reflection in!