Northern Prairie Wildlife Research Center
Population trends of birds that breed in cropland or CRP fields, as determined from Breeding Bird Surveys during 1966-90, in the central region of the United States between the Rocky Mountains and the Mississippi River. Species are listed in order of decreasing abundance within groups.
Species more common in cropland than in CRP fields
Species Population trend Horned lark stable Chestnut-collared longspur stable Vesper sparrow stable Killdeer stable
Species less common in cropland than in CRP fields
Species Population trend Lark bunting declined Grasshopper sparrow declined Red-winged blackbird stable Westem meadowlark stable Savannah sparrow stable Brown-headed cowbird stable Clay-colored sparrow declined Bobolink declined Common yellowthroat stable Sedge wren stable Eastern kingbird stable Westem kingbird increased Barn swallow declined Dickcissel declined Mourning dove stable Baird's sparrow declined