Murmuration!

Can anyone give a reason why they do that flight pattern? Is it the mating time or abundance of flies/insects?

It is so similar to the sardines in the sea....

Thanks for sharing, it is beautiful!
 
Wow!!! I have seen (on a much smaller scale) flocks carry out the same maneuvers - generally they were being 'worked' by a sharpshin or Cooper's hawk. That was an absolutely entrancing video.
 

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