This is one of the sites I would love to see - a starling roost. I saw a mini version just last month in Beverwijk while I was waiting for a bus but it only involved a few hundred birds. Something like this must be quite breath taking though.
BBC NEWS | Scotland | South of Scotland | Starlings blacken motorway skies
When I see them on TV it reminds me of what we use to do with iron filings and a magnet when we were kids.