A flock of Starlings is called a "murmuration" - when thousands/millions of Starlings come together they swarm as if they are one organism. It's a “chorus line effect” – anticipating progress of the wave.
Individual members are anticipating what’s going to happen and they bank absolutely perfectly - as you can see in this clip. Things that look very complicated are actually following just a couple of very simple rules - they don’t want to be the first animal to go down to roost. Some Starlings do fly straight into roost and don’t take part in the displays.
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