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- This list of birds of Wisconsin includes species documented in the U.S. state of Wisconsin and accepted by the Records Committee of the Wisconsin Society for Ornithology (WSORC). As of July 2022 there were 441 species and a species pair included in the official list. Of them, 92 are classed as accidental, 34 are classed as casual, 53 are classed as rare, eight have been introduced to North America, and two are known to be extinct and another is thought to be. An additional 12 species are classed as hypothetical. 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 Wisconsin as permanent residents, summer or winter visitors, or migrants. These tags are used to annotate some species:
* (A) Accidental - species with fewer than one record every five years per the WSO
* (C) Casual - species with at least one record every one to five years per the WSO
* (R) Rare - species found annually but with fewer than eight records per year according to the WSO
* (I) Introduced - species established in North America solely as result of direct or indirect human action
* (E) Extinct - recent species which no longer exist
* (H) Hypothetical - species which have been reported but not confirmed (en)
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