The amazing sight of thousands of starlings swooping, wheeling and darting across the sky in perfect unison.

With the sound on, you'll understand why these flocks are known as "murmurations": the rustle of thousands of pairs of wings. @01000011S
And another one. Incredible.
The starling & falcon dance.

But how do flocks of birds or schools of fish synchronize their movements for a common goal - finding food or, as here, avoiding predators?

Full vid: http://vimeo.com/195138825 

More from Nick Dunlop: http://nickdunlop.com 
There is no leader. Each bird moves independently, sensing & reacting to neighbouring birds.

For starlings, each bird tracks only the 7 closest birds for maximum efficiency, performance & success of the flock.

All described in this fascinating research: https://www.princeton.edu/news/2013/02/07/birds-feather-track-seven-neighbors-flock-together
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