Occurred on September 22, 2017 / Portland, Oregon, USA
Info from Licensor: "Every year, Portlanders gather at Chapman Elementary School to observe Vaux's Swifts as they come in for their evening roost in the school's chimney during their annual fall migration. On this particular night, Audubon volunteers counted 9,480 birds. I shot this entire video with my Samsung Galaxy S7 Edge."
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