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Subspecies Selasphorus sasin sedentarius of Allen’s Hummingbird has been expanding its range in southern California since the 1960s. Nesting near Tijuana, Baja California, in 2014 and 2015 established the first nesting records for Mexico. The species is likely to expand farther into Mexico, and some local displacement of Anna’s Hummingbird (Calypte anna) may be expected. Although it winters primarily in south-central Mexico, Allen’s Hummingbird (Selasphorus sasin) is almost endemic to coastal California during the breeding season (Howell and Webb 1995, AOU 1998). Two subspecies have been described: the smaller migratory nominate sasin, breeding from southwestern Oregon (Marshall et al. 2003) to mainland Ventura County, California, and the larger nonmigratory sedentarius, originally restricted to the Channel Islands (Grinnell and Miller 1944) and subsequently expanding to the nearby mainland (Wells and Baptista 1979). Presumably because of Figure 1. Real del Mar, Baja California, 19 Feb 2015. Allen’s Hummingbirds nested in the dark green tree (cf. Ficus rubiginosa) on the right. Photo by Richard A. Erickson

Allen’s Hummingbird Nests in Mexico: Expansion of Selasphorus sasin sedentarius into Baja California