According to Audubon's climate model, that is likely to remain the case, as the current summer range is forecast to decline by 92 percent by 2080, moving from the Central Valley into the hills of the Coast Range. 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. The Tricolored Blackbird’s range is mostly restricted to California, with more than 95% of the world population breeding in the state. 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. Colonies typically are largest in the Central Valley and are patchily distributed throughout, but particularly in the Coast Ranges and on the coastal slope. 2004. The Tricolored or Tricoloured Blackbird, Agelaius tricolor, is a passerine bird of the family Icteridae. Creative Commons. Found almost exclusively in California, its breeding colonies can teem with up to 25,000 birds, sometimes all settled into a single 10-acre field or wetland to raise their young. Formerly, the Tricolored Blackbird was exempt from protections provided by 1918's Migratory … Geographic Range. Hamilton, W. J. The Tricolored Blackbird can only be found in the southern area of California. Each year, they gather in highly social colonies for breeding throughout the San Joaquin Valley, Sacramento Valley, Sierra Foothills, Central Coast, and Southern California. The Tricolored Blackbird Portal respects the effort and time required of those who contribute to this site; thus, contributors maintain the copyright of their work, and acknowledge the release of their work under a Creative Commons license. More than 99 percent of tricolors live in California; the primary breeding range is the Sacramento and San Joaquin valleys. The Tricolored Blackbird is North America's most colonial landbird. This blackbird is very similar in appearance to the much more common Red-winged Blackbird which is seen in almost all the other regions of continent, east of the Sierra mountain ranges. Fish & Wildlife Service ECOS Environmental Conservation Online System

Native to the United States and Mexico, this bird prefers inland wetland ecosystems, though it can live on arable land. Vertical arrows on the histograms show the annual means of raw counts. The global population of this bird is not quantified but shows a marked and severe decline that necessitates inclusion on the IUCN Red List.

Tricolored blackbird raw colony counts (number of individuals [ind]) recorded during 4 Triennial Tricolored Blackbird Statewide Surveys conducted during 2008, 2011, 2014, and 2017 across much of the species’ geographic range in California, USA.

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