This website provides information on the tricolored blackbird (Agelaius tricolor), a near-endemic California passerine and the most colonial songbird in North America. We seek to develop a site with content appropriate for the largest audience, with basic natural history and conservation information, access to reports, images and videos, links to tricolors in the news, summaries of past and current research and monitoring efforts, and data entry capability for participants in the triennial tricolored blackbird survey (an every three year volunteer effort to estimate the number of tricolors in California) and persons observing color-banded tricolors.

Help: Report Observations of Color-banded Tricolors

Merced Banded female

Tricolored blackbirds have been banded each year since 2007. As of the beginning of 2014, a total of just under 53,000 tricolors has been banded. From 2007-2009, most of the banded birds (nearly all adults) received both USGS aluminum bands as well as two color bands, one color indicating year, and the other indicating site of banding. Sightings of these color-banded birds are especially important, and the Tricolored Blackbird Portal enables you to enter records of observations ("resightings") of color-banded birds.

Resightings of color-banded tricolored blackbirds enable investigators to document spatial and temporal patterns of tricolor movements and have been extremely helpful in identifying new colonies from previously unknown locations. We urge you to record your observations of color-banded tricolors here:


Primary support for the development of this website was provided by the U.S. Fish & Wildlife Service, with additional funding provided by the National Biological Information Infrastructure, a federal agency that was discontinued in January, 2012.

Collaborators on this website include the Information Center for the Environment (U.C. Davis), U.S. Fish & Wildlife Service, Audubon California, the California Department of Fish & Wildlife, Sustainable Conservation, Point Blue (formerly PRBO) Conservation Science, and Ted Beedy.

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