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- This list of birds of Washington includes species credibly documented in the U.S. state of Washington. Unless otherwise noted, the list is that of the Washington Bird Records Committee (WBRC) of the Washington Ornithological Society. As of November 2021, the list contained 522 species. Of them, 159 are considered accidental; 11 were introduced to North America or directly in Washington, and 13 have only sight records. Five species that have not been seen since 1971 have the year of the most recent sighting noted. This list is presented in the taxonomic sequence of the Check-list of North and Middle American Birds, 7th edition through the 62nd Supplement, published by the American Ornithological Society (AOS). Common and scientific names are also those of the Check-list, except that the common names of families are from the Clements taxonomy because the AOS list does not include them. Unless otherwise noted, all species listed below are considered to occur regularly in Washington as permanent residents, summer or winter visitors, or migrants. The following codes are used to annotate some species:
* (A) Accidental - species which have "20 or fewer Washington records during the previous 10-year period" according to the WBRC. The WBRC requires a formal report for sightings of these species to be included in the official record.
* (S) Sight record - species whose records are supported only by written documentation, per the WBRC
* (I) Introduced - a species introduced to Washington by humans, either directly or indirectly (en)
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