Over the past two years the American Ornithological Society (AOS) has made significant changes to the taxonomic order of bird species. To accommodate these changes, the WSO has updated the Checklist of the Birds of Wisconsin in both 2017 and 2018. The taxonomic order shown below is correct as of the 59th Supplement of the AOS. Although there have been major changes in the order of species, this last supplement contains no spit or lump that pertains to Wisconsin species. There has been one name change, that being the Gray Jay re-named Canada Jay. In 2018 three new species were added to the Wisconsin Checklist. Those three were Tufted Duck, Sharp-tailed Sandpiper, and Hammond’s Flycatcher. These additions increased the state total of valid species to 441.
Decisions regarding the inclusion of species on this list are made by the WSO Records Committee. Contact firstname.lastname@example.org for more information.
The checklist is available as a PDF file or an Excel Spreadsheet:
Last updated January 15, 2019.