BirdAnalyst
BBS Route · Wisconsin · BCR 23

Hudson Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 133 species recorded across 54 survey years, still active.

133Species 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 →
54Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2024Span
3Observers

Bird Species Found on Wisconsin Hudson

Top 40 of 133 species by most recent count. Each links to its species trend.

Species recorded on the Hudson 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-winged BlackbirdIcteridae1002024-7%1968
American CrowCorvidae572024+60%1968
Double-crested CormorantPhalacrocoracidae46202418×1993
Barn SwallowHirundinidae362024+20%1968
American RobinTurdidae362024+39%1968
Common GrackleIcteridae312024-73%1968
Mourning DoveColumbidae302024-14%1968
Wild TurkeyPhasianidae302024+780%2001
Cedar WaxwingBombycillidae242023+45%1968
Canada GooseAnatidae242024+121%1975
Rock PigeonColumbidae232024+48%1968
Cliff SwallowHirundinidae232024+37%1970
European StarlingSturnidae222024-80%1968
Black-capped ChickadeeParidae17202415×1975
Horned LarkAlaudidae162024-27%1968
Northern House WrenTroglodytidae142024-10%1968
Trumpeter SwanAnatidae132024+111%2009
Brown-headed CowbirdIcteridae112024-43%1968
Indigo BuntingCardinalidae112024-31%1968
Common YellowthroatParulidae112024+44%1968
MallardAnatidae102024+163%1968
Great Blue HeronArdeidae102024+420%1974
BobolinkIcteridae92024-70%1968
Eastern MeadowlarkIcteridae92024+40%1968
American GoldfinchFringillidae82024-28%1968
Clay-colored SparrowPasserellidae82024-54%1968
Song SparrowPasserellidae82024-63%1968
Red-eyed VireoVireonidae82024+200%1968
Wood DuckAnatidae82024+120%1975
Sandhill CraneGruidae82024-10%2016
Vesper SparrowPasserellidae72024-90%1968
Blue JayCorvidae62024+4%1969
Baltimore OrioleIcteridae62024-9%1968
Turkey VultureCathartidae62023+150%2002
Blue-winged TealAnatidae52024-29%1968
KilldeerCharadriidae52024-7%1968
Chipping SparrowPasserellidae52024+125%1968
Northern CardinalCardinalidae52024+271%1970
House SparrowPasseridae52024-89%1968
Ring-necked PheasantPhasianidae42024-58%1968

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