Prepared by William J. Hamilton III (wjhamilton@ucdavis.edu) Department of Environmental Science and Policy 1 Shields Avenue, Davis, CA 95616 530-752-1122 VOX, 530-752-3350 fax RECOMMENDED CITATION. Tricolored Blackbird(Agelaius tricolor) Photo by James Gallagher, Sea and Sage Audubon . This map depicts the range boundary, defined as the areas where the species is estimated to occur at a rate of 5% or more for at least one week within each season. Geographic Range. The tricolored blackbird (Agelaius tricolor) breeds in dense colonies in California’s Central Valley, coast ranges and Southern California. More than 99 percent of tricolors live in California; the primary breeding range is the Sacramento and San Joaquin valleys. Tricolored blackbird populations have declined due to habitat loss resulting from water diversions, draining of wetlands, conversion of wetlands to agriculture, conversion of row crops to orchards or other unsuitable crops, and urbanization (UC Davis 2018). The Tricolored Blackbird has a small range, found almost entirely in California. Its range is limited to the coastal areas of the Pacific coast of North America, from Northern California in the U.S. (with occasional strays into Oregon), to upper Baja California in Mexico. Tricolored blackbirds (Agelaius tricolor) are found in western coastal North America.They are native to California and parts of Oregon, Washington, and Nevada. The Tricolored Blackbird is included on the 2014 State of the Birds Watch List.Already listed as Endangered by the IUCN-World Conservation Union, the species is a now candidate for listing under the U.S. Tricolored Blackbird 437 Breeding range of the Tricolored Blackbird in California. Tricolored blackbirds (Agelaius tricolor) are found in western coastal North America. Colonies typically are largest in the Central Valley and are patchily distributed throughout, but particularly in the Coast Ranges and on the coastal slope. Acknowledgements. While the Red-winged Blackbird is abundant over most of the continent, the similar Tricolored Blackbird has a very small range in the Pacific states. The larger problem for the Tricolored Blackbird, in fact, may be water usage practices in California. Native to the United States and Mexico, this bird prefers inland wetland ecosystems, though it can live on arable land. Farming Tricolor Blackbirds. Vertical arrows on the histograms show the annual means of raw counts. The Central Valley has always been the stronghold of the species, and the largest breeding colonies of this highly social species continue to occur in the valley. The tricolored blackbird (Agelaius tricolor) is a passerine bird of the family Icteridae.Its range is limited to the coastal areas of the Pacific coast of North America, from Northern California in the U.S. (with occasional strays into Oregon), to upper Baja California in Mexico.

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