BirdAnalyst
BBS Route · Wisconsin · BCR 23

Hudson Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 135 species recorded across 56 survey years, still active.

135Species 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 →
56Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2025Span
3Observers

Bird Species Found on Wisconsin Hudson

Top 40 of 135 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 BlackbirdIcteridae1472025-5%1968
European StarlingSturnidae602025-75%1968
Cliff SwallowHirundinidae582025+203%1970
American CrowCorvidae332025+29%1968
American RobinTurdidae302025+42%1968
Rock PigeonColumbidae272025+5%1968
Common GrackleIcteridae252025-73%1968
Double-crested CormorantPhalacrocoracidae23202520×1993
MallardAnatidae222025+350%1968
Horned LarkAlaudidae182025+0%1968
Chipping SparrowPasserellidae182025+250%1968
Common YellowthroatParulidae152025+56%1968
Black-capped ChickadeeParidae15202514×1975
Clay-colored SparrowPasserellidae142025-32%1968
Trumpeter SwanAnatidae132025+222%2009
KilldeerCharadriidae122025+11%1968
Mourning DoveColumbidae122025-21%1968
Song SparrowPasserellidae122025-50%1968
Blue JayCorvidae102025+12%1969
Brown-headed CowbirdIcteridae102025-46%1968
Northern CardinalCardinalidae102025+286%1970
Indigo BuntingCardinalidae102025-14%1968
Gray CatbirdMimidae102025+19%1968
BobolinkIcteridae92025-71%1968
American GoldfinchFringillidae82025-8%1968
House SparrowPasseridae82025-89%1968
Canada GooseAnatidae82025+41%1975
Ring-necked PheasantPhasianidae72025-61%1968
Barn SwallowHirundinidae72025+10%1968
Yellow WarblerParulidae72025+21%1968
Baltimore OrioleIcteridae62025-9%1968
Northern House WrenTroglodytidae62025+0%1968
Blue-winged TealAnatidae52024-36%1968
Eastern BluebirdTurdidae52025-36%1971
Great Blue HeronArdeidae52025+360%1974
Sandhill CraneGruidae52025-10%2016
Great Crested FlycatcherTyrannidae42025-29%1968
Eastern Wood-PeweeTyrannidae42024-20%1968
Red-bellied WoodpeckerPicidae42024+233%1981
House FinchFringillidae42025+125%2004

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