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Brown-headed Cowbird Molothrus ater

Common in open landscapes and highly fragmented forest at low to middle elevation, but largely absent from intact, moist conifer forest. Most concentrated in agricultural and developed landscapes in western counties and in steppe, rangeland, and open forests of Kittitas County. Obligate brood parasite, laying eggs in nests of other species. Host species not always determined by BBA observers, but following noted: Dusky Flycatcher, Warbling and Red-eyed Vireos, Golden-crowned Kinglet, American Robin, Nashville, Yellow-rumped, Black-throated Gray, and MacGillivray's Warblers, Common Yellowthroat, Western Tanager, Spotted Towhee, Song and White-crowned Sparrows, Dark-eyed Junco, Brewer's Blackbird, House Finch.