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Brewer's sparrow has decreased in some parts of its range. Causes are not well understood, but it is suspected that the decline is due at least in part to destruction of sagebrush habitat. Additional information on resource use and limitation during the wintering season is desperately needed.
Chipping sparrow, Spizella passerina; Clay-colored sparrow, Spizella pallida; Field sparrow, Spizella pusilla; Brewer's sparrow, Spizella breweri; Fox sparrow, Passerella iliaca; American tree sparrow, Spizelloides arborea; Dark-eyed junco, Junco hyemalis; Yellow-eyed junco, Junco phaeonotus (A) White-crowned sparrow, Zonotrichia leucophrys
Chipping sparrow: Spizella passerina (Bechstein, 1798) 32 Clay-colored sparrow: Spizella pallida (Swainson, 1832) 33 Black-chinned sparrow: Spizella atrogularis (Cabanis, 1851) 34 Field sparrow: Spizella pusilla (Wilson, A, 1810) 35 Brewer's sparrow: Spizella breweri Cassin, 1856: 36 Worthen's sparrow: Spizella wortheni Ridgway, 1884: 37 Sierra ...
American tree sparrow, Spizelloides arborea; Bachman's sparrow, Peucaea aestivalis (A) Black-throated sparrow, Amphispiza bilineata (A) Brewer's sparrow, Spizella breweri (A) Cassin's sparrow, Peucaea cassieucanii (A) Chipping sparrow, Spizella passerina; Clay-colored sparrow, Spizella pallida; Dark-eyed junco, Junco hyemalis
Brewer's sparrow, Spizella breweri. Timberline sparrow, Spizella breweri taverneri; Field sparrow, Spizella pusilla; Worthen's sparrow, Spizella wortheni; Black-chinned sparrow, Spizella atrogularis; The American tree sparrow, Spizelloides arborea, was formerly a member of this group, but is now placed in its own monotypic genus Spizelloides. [2]
Chipping sparrow, Spizella passerina; Clay-colored sparrow, Spizella pallida; Field sparrow, Spizella pusilla; Brewer's sparrow, Spizella breweri (A) Fox sparrow, Passerella iliaca; American tree sparrow, Spizelloides arborea; Dark-eyed junco, Junco hyemalis; White-crowned sparrow, Zonotrichia leucophrys; Harris's sparrow, Zonotrichia querula (A)
Bachman's sparrow, Peucaea aestivalis (Ex) Grasshopper sparrow, Ammodramus savannarum; Lark sparrow, Chondestes grammacus (C) Lark bunting, Calamospiza melanocorys (A) Chipping sparrow, Spizella passerina; Clay-colored sparrow, Spizella pallida; Field sparrow, Spizella pusilla; Brewer's sparrow, Spizella breweri (A) Fox sparrow, Passerella iliaca
Field sparrow, Spizella pusilla; Brewer's sparrow, Spizella breweri; Fox sparrow, Passerella iliaca; American tree sparrow, Spizelloides arborea; Dark-eyed junco, Junco hyemalis; White-crowned sparrow, Zonotrichia leucophrys; Golden-crowned sparrow, Zonotrichia atricapilla (A) Harris's sparrow, Zonotrichia querula; White-throated sparrow ...