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Black-necked Stilts breed primarily in the United States and regions farther south. However, the breeding range has expanded northward in recent decades, with the first confirmed nests in Canada found near Edmonton, at Beaverhill Lake, in 1977 (Dekker et al. 1979). Breeding has since been confirmed in British Columbia (Tomlinson 2005, British Columbia Breeding Bird Atlas 2011), Saskatchewan (Smith 1996), and Ontario (Peck et al. 2004; see also review in Gratto-Trevor 2002). This range expansion in Canada appears to represent new colonisation of areas, rather than a return to a former range, and indicates a large increase in the population in Canada since 1970. However, because there are no long-term surveys in Canada that reliably monitor the species, the reliability of this assessment is considered only medium. The population size in the United States has also exhibited large increases since about 1970, based on results from the Breeding Bird Survey.
Additional information on: Breeding Bird Survey in North America (BBS) - U.S. analyses