BirdAnalyst
BBS Route · Iowa · BCR 22

Hudson Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 99 species recorded across 33 survey years, still active.

99Species 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 →
33Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1967–2022Span
8Observers

Bird Species Found on Iowa Hudson

Top 40 of 99 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 BlackbirdIcteridae2102022+137%1969
European StarlingSturnidae652022+19%1969
House SparrowPasseridae632022-52%1969
Common GrackleIcteridae542022-76%1969
American RobinTurdidae502022+98%1969
American CrowCorvidae452022+44%1969
DickcisselCardinalidae412022-5%1969
Mourning DoveColumbidae312022+41%1969
Northern CardinalCardinalidae272022+957%1970
American GoldfinchFringillidae172022-42%1969
Rock PigeonColumbidae162022-40%1969
Barn SwallowHirundinidae162022+11%1969
Brown-headed CowbirdIcteridae152022+178%1969
Song SparrowPasserellidae152022-21%1969
Blue JayCorvidae132022+74%1969
Eastern MeadowlarkIcteridae132022+300%1969
Northern House WrenTroglodytidae122022-32%1969
KilldeerCharadriidae112022+500%1969
Chipping SparrowPasserellidae112022+70%1969
Baltimore OrioleIcteridae92022+0%1969
Common YellowthroatParulidae92022-5%1969
Tree SwallowHirundinidae92022+39%2007
Ring-necked PheasantPhasianidae82022-73%1969
Gray CatbirdMimidae82022+480%1969
Northern Rough-winged SwallowHirundinidae72013+233%1983
BobolinkIcteridae62022-57%1969
Rose-breasted GrosbeakCardinalidae62022+11%1969
Black-capped ChickadeeParidae62022+275%1981
Eastern BluebirdTurdidae62013+233%1986
Turkey VultureCathartidae62022+400%2006
House FinchFringillidae62021+0%1996
Indigo BuntingCardinalidae52022+157%1969
Red-bellied WoodpeckerPicidae52022+333%1971
Yellow-billed CuckooCuculidae42021+50%1971
Eastern Wood-PeweeTyrannidae42022+200%1969
Great Crested FlycatcherTyrannidae42022+57%1979
Cedar WaxwingBombycillidae42022+113%1981
Canada GooseAnatidae42022+50%1990
Cooper's HawkAccipitridae42013n/an/a
Red-headed WoodpeckerPicidae32022-70%1969

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