The Bachman's Sparrow is very similar to Botteri's and Cassin's Sparrows but their ranges do not overlap. They have different songs and different habitat preferences with the Bachman's Sparrow inhabiting open woods with a grassy, shrubby understory and Cassin's and Botteri's preferring more open habitats. Cassin's has barred central tail feathers and a few streaks on the flanks.
Length and wingspan from: Robbins, C.S., Bruun, B., Zim, H.S., (1966). Birds of North America. New York: Western Publishing Company, Inc.