Meanwhile, blackbirds aren’t the only birds threatened directly by the poison. We ’ve noted the presence of 68 other species of grassland songbirds in the proposed poison-baited areas ... including the Bobolink, Grasshopper Sparrow, Harris ’ Sparrow and Le Conte’s Sparrow.
Many birds are threatened by poison.  69 known species of grassland songbirds in proposed poisoned baited areas are threatened.