Why do flocks of birds swoop and swirl together in the sky?

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Why do flocks of birds swoop and swirl together in the sky?: A shape-shifting flock of thousands of starlings, called a murmuration, is amazing to see. As many as 750,000 birds join together in flight. The birds spread out and come together. The flock splits apart and fuses together again. Murmurations constantly change direction, flying up a few hundred meters, then zooming down to almost crash to the ground. They look like swirling blobs, making teardrops, figure eights, columns and other shapes. A murmuration can move fast – starlings fly up to 50 miles per hour (80 kilometers per hour).

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