Tyrant-flycatchers (Tyrannidae)

Olive-sided Flycatcher (Contopus cooperi) - HBW 9, p. 367

French: Moucherolle à côtés olive German: Olivflanken-Schnäppertyrann Spanish: Pibí Boreal

Taxonomy: Muscicapa cooperi Nuttall, 1831, latitude 54º N, banks of the River Saskatchewan, Canada.
Formerly placed in a monotypic genus, Nuttallornis; also, previously referred to as C. borealis, but that name preceded by present one. Closest relatives possibly C. fumigatus, C. sordidulus and C. virens. Larger birds in SW (S California, N Baja California) sometimes treated as a geographical race, marjorinus. Monotypic.

Distribution: Breeds from N & W Alaska E across C Canada to Maritime Provinces, and S in USA to N California, also locally into NW Mexico (Baja California), in interior through Idaho and W Montana to NE Arizona and NW New Mexico and, in E, to boreal regions of Adirondacks and New England. Winters locally in W & S Mexico (from Jalisco and S Veracruz) S to Panama and (mainly in mountainous regions) from Colombia and Venezuela S to SE Peru and NW Bolivia; more locally in the Guianas, S Amazonia (from lower R Amazon S to C Bolivia and Tapajós basin) and SE Brazil.