In reply to Sophie G.:
> Yes, choughs fly upside down, sideways, backwards, you name it.
One of my favourite ways to waste a few hours here in Chamonix is to go to the top of the Aiguille du Midi with a bag of old croissants and feed the choughs. They'll happily eat out of your hand once they get to know you, but it's much more fun to lob a few crumbs off the viewing platforms and watch them swoop and dive in the howling winds, catching them in mid-flight. Their aerobatics are just beyond belief sometimes.
Unfortunately, I live in town at around 1000m, and I don't get choughs in the garden, only sparrows, tits, and blackbirds. It is a great source of sorrow for me.