This is rather spectacular footage of starlings "dancing" in the skies over Loch Ree in Ireland as they prepare to roost for the evening. The hundreds of birds appear to move as one, expanding and contracting, in a dynamic, hypnotising and rather magical display.
It's a long film but it's worth watching in its entirety — the action and the film-maker's language heats up at around the 5.10min mark.
(Via Irish Central)
The phenomenon is known as murmuration. The Danes call it sort sol, which means black sun.
