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American Tree Sparrow (Spizella arborea)
http://www.mbr-pwrc.usgs.gov/id/framlst/i5590id.html
Photos, identification tips, Christmas Bird Count map, and taxonomy chart.
Brewer's Sparrow (Spizella breweri)
http://www.mbr-pwrc.usgs.gov/id/framlst/i5620id.html
Identification tips, photos, range map, and taxonomy chart.
Chipping Sparrow (Spizella passerina)
http://birds.cornell.edu/BOW/CHISPA/
Illustration, sound file, and description of this bird's nesting and diet.
Clay-colored Sparrow (Spizella pallida)
http://birds.cornell.edu/crows/claycolor.htm
Close-ups photos of this species.