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We examined relative abundances of grassland birds among Conservation Reserve Program (CRP) fields seeded with 2 monocultures of introduced grass species and 2 mixes of native grasses in the Southern High Plains of Texas. We assessed bird compositions among these 4 cover types and between the cover types pooled into categories of introduced and native fields. Breeding season bird diversity and total abundance did not differ among cover types or between introduced and native fields. Grasshopper Sparrows (Ammodramus savannarum), Cassin's Sparrows (Aimophila cassinii), and Western Meadowlarks (Sturnella neglecta) accounted for more than 90% of breeding season detections. Grasshopper Sparrows were the most abundant...