This very close relative to the Chimney Swift has very little overlap in range. The Chimney mainly sticks east of the Rockies and the Vaux's are west of the Rockies. I photographed this Vaux's in Eugene Oregon where they are common. I was careful to check with Merlin on the sound ID. I think only one Chimney Swift has been documented in Eugene back in 2014 so I was fairly positive the ID.
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