Empidonax traillii alnorum
Upton, Maine, USA.
See E. albigularis (above). Formerly considered conspecific with E. traillii. Birds in NW of range (Alaska, Yukon Territory and NW Mackenzie), named as race alascensis, may average larger, with paler head and slightly paler back; further study needed. Monotypic.
W Alaska S to SC British Columbia and E to Canadian Maritime provinces, and from Great Lakes E in USA to New England and S to N Indiana, Ohio and, in Appalachians, to North Carolina. Winters mainly W South America from NW Venezuela, Colombia and E Ecuador S to E Peru and N & E Bolivia; probably also in E Panama and N Argentina.
Food and feeding
Status and conservation
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