Hundreds of Vaux's swifts (Chaetura vauxi) circle then dive into the chimney at the Wagner Center in Monroe, Washington, during their fall migration. Vaux's swifts do not have back talons, so they cannot stand or perch. They roost by clinging to rough surfaces, mainly old-growth trees, but also old chimneys and smoke stacks that do not have smooth interior liners. As many as 26,000 Vaux's swifts have perched in the Monroe chimney at a time.
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