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During Labor Day long weekend, I happened to be in NW Portland area where I was able to watch Vaux's Swifts flying back a huge chimney before sunset.
It was amazing to see a flock of small birds flying in the sky and then form into tornado pattern before entering the chimney.
看到一群小鳥在天空中飛翔，然後在進入煙囪之前形成龍捲風圖案，真是太神奇了!
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