BirdAnalyst
BBS Route · Wisconsin · BCR 12

Couderay Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 147 species recorded across 50 survey years, still active.

147Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
50Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1969–2025Span
11Observers

Bird Species Found on Wisconsin Couderay

Top 40 of 147 species by most recent count. Each links to its species trend.

Species recorded on the Couderay route.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
Common YellowthroatParulidae262025-5%1972
American RobinTurdidae222025+23%1972
American CrowCorvidae202025-77%1972
Red-eyed VireoVireonidae192025+1%1972
Song SparrowPasserellidae172025-32%1972
Ring-billed GullLaridae162012+700%1993
Common GrackleIcteridae152025-59%1972
Chestnut-sided WarblerParulidae132025+56%1972
Tree SwallowHirundinidae102019-58%1972
Nashville WarblerParulidae92019+0%1972
Red-winged BlackbirdIcteridae82025-88%1972
Yellow WarblerParulidae82025-41%1972
Mourning DoveColumbidae72019+31%1973
Yellow-bellied SapsuckerPicidae62019+175%1973
Bank SwallowHirundinidae62017+9%1972
OvenbirdParulidae62025-10%1972
Wood ThrushTurdidae62025-61%1972
VeeryTurdidae62025-44%1972
Eastern BluebirdTurdidae62019+89%1972
American BitternArdeidae42017-56%1974
Rock PigeonColumbidae42019+346%1973
Eastern Wood-PeweeTyrannidae42025-39%1972
Baltimore OrioleIcteridae42019-75%1972
Brewer's BlackbirdIcteridae42011+31%1972
Chipping SparrowPasserellidae42025-41%1972
Rose-breasted GrosbeakCardinalidae42025-54%1972
Black-and-white WarblerParulidae42025+10%1972
Gray CatbirdMimidae42025-49%1972
Swamp SparrowPasserellidae42025+200%1975
Blue JayCorvidae32025-45%1972
Common RavenCorvidae32025-27%1973
European StarlingSturnidae32019-79%1972
Northern Rough-winged SwallowHirundinidae32016+25%1973
Yellow-throated VireoVireonidae32025+120%1972
Northern House WrenTroglodytidae32025-74%1972
Ruby-throated HummingbirdTrochilidae32019+75%1978
Red-bellied WoodpeckerPicidae32018+133%1990
Common LoonGaviidae22019-42%1972
MallardAnatidae22019-33%1972
Belted KingfisherAlcedinidae22019+0%1973

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.