It's referred to as a: Murmuration, & they're making those patterns as a consequence of safety ie starlings on the edge, fly to the centre, continually. It's quite a phenomenon 

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Fun to watch. Mankind is often so busy struggling, that few find the time to enjoy the beauty and wonder of nature, and our fellow creatures. Take those moments to help you to stay grounded.
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I saw birds that were probably starlings also just like this a few years ago. But the ones I saw lasted for over an hour of nonstop birds. It was one of the coolest things I've ever seen. There had to be millions of them
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After an unfortunate kayaking accident, a teammate drowned - she did not make it. During the memorial, our paddling team was similarily surrounded by hundreds of birds as well... out on the Bay. We knew was her looking down on us. Surreal. Beautiful.
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Pretty sure they formed a d!ck 4 seconds in.
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Oh man. Thanks. I thought I was the only dude that saw that. Or would admit it. Lmao.
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Even the birds know the deal: Together we stand, divided we fall. Nature rocks. cc
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Interesting geometric patterns
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This is so cool and Scary at the same time!
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@PuddnHaid You mean like this?Thanks. Twitter will use this to make your timeline better. UndoUndo
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I've seen the same in Oregon... it's called a "murmuration"... love the word!
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It’s called a murmuration. It’s a beautiful thing to see.
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Love the toroid shapes
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It's called a murmuration.
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Wow, Gods creation that no man can do! Not even Trump.pic.twitter.com/TJCQER0DNn
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