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The Vaux’s Swift breeds in the mountains of western North America and winters primarily in Central America. In addition, a resident population lives in Central America and northern Venezuela year-round (Bull and Collins 2007). The species is not well monitored anywhere in its range; Breeding Bird Survey data indicate a large decrease in population size in Canada since 1973, but the status assessment has low reliability. Conservation concerns for the species centre on its preference for nesting in large hollow trees, an increasingly rare feature in forests and woodlands. This species has been identified as a priority for conservation and/or stewardship in one or more Bird Conservation Region Strategies in Canada.
Unlike its close relative the Chimney Swift, the Vaux's Swift still nests and roosts primarily in large, hollow trees, particularly red cedar and cottonwood (Bull and Collins 2007). These have become rare over the past century, which may be limiting the swifts' breeding opportunities (Bull and Collins 2007). The Vaux's Swift is one of several species of aerial insectivores (birds that catch flying insects) showing widespread declines in Canada. Causes of these declines remain unclear, but changes in aerial insect populations have been suggested as one possible common factor as well as landscape changes, the effects of insecticides on prey, and climate change (Blancher et al. 2009, Nebel et al. 2010).
Environment and Climate Change Canada and partners have developed Bird Conservation Region Strategies in each of Canada’s Bird Conservation Regions (BCRs). In these strategies, selected species are identified as priorities for one or more of the following reasons:
Select any of the sub-regions below to view the BCR strategy for additional details.