Checklist of Wisconsin Birds
This checklist contains all the valid species on the Wisconsin state list as of March 2025. Nomenclature and sequence follow the 65th supplement of the Checklist of North American Birds published by the Classification Committee of the American Ornithologists’ Union. Decisions regarding the inclusion of species on this list were made (or will be made) by the Records Committee of the Wisconsin Society for Ornithology.
This update reflects the following changes to the Wisconsin checklist.
Lumps and Splits:
Mew Gull has been split into two species. The species occurring in Wisconsin is now called Short-billed Gull.
Cattle Egret has been split into two species. The species occurring in Wisconsin is now called Western Cattle-Egret.
Northern Goshawk has been split into two species. The species occurring in Wisconsin is now called American Goshawk.
Barn Owl has been split into three species. The species occurring in Wisconsin is now called American Barn Owl.
House Wren has been split into 7 species. The species occurring in Wisconsin is now called Northern House Wren.
Common and Hoary Redpolls have been lumped. The species is now called Redpoll.
Additions:
American Flamingo (Pending Records Committee Review)
Allen's Hummingbird
Buff-bellied Hummingbird
Limpkin
Bar-tailed Godwit (Pending Records Committee Review)
Arctic Loon
Short-tailed Shearwater
Brown Booby
Gray Flycatcher
Fish Crow (Pending Records Committee Review)
Fieldfare (Pending Records Committee Review)
White Wagtail (Pending Records Committee Review)
European Goldfinch – now considered established in Wisconsin by the American Birding Association
Flame-colored Tanager
Varied Bunting (Pending Records Committee Review)
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The state total of valid species remains at 457 with 9 hypothetical species.
Decisions regarding the inclusion of species on this list are made by the WSO Records Committee. Contact records@wsobirds.org for more information.
The checklist is available as a PDF file or an Excel Spreadsheet:
Last updated March 23, 2025.
