Big Bend National Park, Texas, to at least the Sierra Madera in central Coahuila, Mexico. In Oklahoma, the black-capped vireo is found only in Blaine, Cleveland, Cotton and Comanche Counties. The winter range of this vireo is not well known. It is thought to winter along the west coast of Mexico from southern Sonora to Guerrero. Conservation The black-capped vireo is threatened by brown-headed cowbird (Molothrus ater) brood parasitism, human disturbance, and loss of habitat to urbanization, fire exclusion, grazing, and brush control. With population sizes now well into the tens of thousands, the species continues to be managed by the Texas Parks and Wildlife Department and the Oklahoma Department of Conservation. Conservation efforts by the U.S. Army are continuing to enhance the conservation status of the black-capped vireo. See also Balcones Canyonlands National Wildlife Refuge References External links U.S. Fish and Wildlife Service, Black-capped Vireo (Vireo atricapilla) Black-capped Vireo photo gallery. Visual Resources for Ornithology, Drexel University Black-capped Vireo video with song BirdLife Species Factsheet. black-capped vireo Native birds of the Plains-Midwest (United States) Birds of the Rio Grande valleys Birds of Mexico Endemic birds of Southwestern North America black-capped vireo black-capped vireo ESA endangered species