The breeding range of Vaux's Swift (Chaetura vauxi) in Canada is restricted to southern and western British Columbia (Godfrey 1986). Although thousand of Vaux's Swifts are reported each year in British Columbia, only 17 nesting sites have been confirmed. Of these, 11 were in chimneys, one was in the roof of a railway water tank, one was in a bigleaf maple (Acer macrophyllym), two were in hollow black cottonwoods (Populus trichocarpa), one was in a "candelabra" western redcedar (Thuja plicata), and one was undescribed. Recent research in Canada and the United States has confirmed the dependence of Vaux's Swift on old-growth stands containing hollow trees or snags with nesting cavities. As these habitats are lost to logging and development, Vauz's Swift populations are expected to decline. The current population in British Columbia is estimated to be between 25,000 and 50,000 birds.
Summers, K., Gebauer, M... 1995. Status of the Vaux's Swift in British Columbia. Ministry of Environment, Lands and Parks. Species Status Report. WR67