My local starlings have been putting on an aerial display again. Not for me standing out in the freezing cold when I can sit in my conservatory and watch the starlings formation flying display. They were doing this for over an hour and were often much closer than in the picture, you could see their wings flapping. Apparently each bird keeps an eye on the seven birds around it so that it keeps in formation but what I want to know is 'why?'. We've decided (and hope) that this is the starling version of a pub crawl, that they do this because they can, because they enjoy it, a sort of bird Mexican wave.
Anyone leaving for work at dawn will also know they do this in the mornings - I often see their display on my way to work - on the days when the sun is up before me.