BirdAnalyst
BBS Route · Wisconsin · BCR 12

Couderay Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 147 species recorded across 49 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 →
49Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1969–2019Span
10Observers

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
Red-eyed VireoVireonidae522019+41%1972
American RobinTurdidae492019+42%1972
OvenbirdParulidae482019+21%1972
Chestnut-sided WarblerParulidae262019+90%1972
Song SparrowPasserellidae232019-34%1972
VeeryTurdidae182019-26%1972
Ring-billed GullLaridae162012+700%1993
Blue JayCorvidae132019-38%1972
Chipping SparrowPasserellidae132019-19%1972
American CrowCorvidae122019-79%1972
Common YellowthroatParulidae112019-13%1972
Indigo BuntingCardinalidae102019-57%1972
Tree SwallowHirundinidae102019-58%1972
Yellow WarblerParulidae102019-29%1972
Gray CatbirdMimidae102019-36%1972
American GoldfinchFringillidae92019-75%1972
Rose-breasted GrosbeakCardinalidae92019-46%1972
Nashville WarblerParulidae92019+0%1972
Mourning DoveColumbidae72019+31%1973
Alder FlycatcherTyrannidae72019+214%1972
Red-winged BlackbirdIcteridae72019-83%1972
Yellow-bellied SapsuckerPicidae62019+175%1973
Bank SwallowHirundinidae62017+9%1972
Yellow-throated VireoVireonidae62019+80%1972
Pine WarblerParulidae62019+133%1972
American RedstartParulidae62019-30%1972
Black-capped ChickadeeParidae62019-43%1972
Eastern BluebirdTurdidae62019+89%1972
Swamp SparrowPasserellidae62019+160%1975
White-throated SparrowPasserellidae52019+67%1972
Mourning WarblerParulidae52019-67%1972
American BitternArdeidae42017-56%1974
Rock PigeonColumbidae42019+346%1973
Common RavenCorvidae42019-33%1973
Baltimore OrioleIcteridae42019-75%1972
Brewer's BlackbirdIcteridae42011+31%1972
Eastern Wood-PeweeTyrannidae32019-39%1972
European StarlingSturnidae32019-79%1972
Northern Rough-winged SwallowHirundinidae32016+25%1973
Black-and-white WarblerParulidae32019+30%1972

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.