As of 2016, the cowbird traps still capture 4,000 cowbirds a season. Mockingbird nests are also often parasitized by cowbirds. Brood parasites include the cowbirds and many Old World cuckoos. Brood parasitism by cowbirds in North America or cuckoos in Eurasia is rare. Brood parasites include birds in different families such as cowbirds, whydahs, cuckoos, and black-headed ducks. Curved-billed Thrashers are rarely victims of nest parasitism by cowbirds. Western tanager nests are parasitized by brown-headed cowbirds ("Molothrus aster"). The flycatcher is a frequent victim of brood parasitism by brown-headed cowbirds. This species is frequently parasitized by brown-headed cowbirds. Brown-headed cowbirds ("Molothrus ater") parasitize eastern towhee nests. The American goldfinch is occasionally victim to brood parasites, particularly brown-headed cowbirds. Brood parasitism by brown-headed cowbirds, for example, increases as a result of nearby logging. In the southern part of the breeding range, nest parasitism by cowbirds is frequent. Up to 12 female screaming cowbirds can parasitize the same baywing nest. The nest is sometimes parasitised by "Molothrus" cowbirds.