BirdAnalyst
BBS Route · Illinois · BCR 22

Duncan Mills Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 92 species recorded across 31 survey years, still active.

92Species 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 →
31Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1993–2024Span
3Observers

Bird Species Found on Illinois Duncan Mills

Top 40 of 92 species by most recent count. Each links to its species trend.

Species recorded on the Duncan Mills 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 BlackbirdIcteridae1182024-5%1995
European StarlingSturnidae822024+163%1995
American RobinTurdidae652024+184%1995
DickcisselCardinalidae562024+46%1995
Cliff SwallowHirundinidae512024-6%2018
Brown-headed CowbirdIcteridae392024+187%1995
Mourning DoveColumbidae372024+145%1995
Indigo BuntingCardinalidae332024+24%1995
KilldeerCharadriidae232024+65%1995
American CrowCorvidae202024-43%1995
Common YellowthroatParulidae202024+61%1995
Northern CardinalCardinalidae192024+47%1995
Eastern MeadowlarkIcteridae182024-39%1995
House SparrowPasseridae162024-33%1995
Eastern KingbirdTyrannidae152024+357%1997
Northern House WrenTroglodytidae142024+90%1995
Barn SwallowHirundinidae132024-54%1995
Blue JayCorvidae122024-37%1995
Warbling VireoVireonidae122024+800%1996
Purple MartinHirundinidae112024+229%2001
Red-headed WoodpeckerPicidae102024+438%1995
Gray CatbirdMimidae102024+200%1995
Red-bellied WoodpeckerPicidae82024-12%1995
Common GrackleIcteridae82024-45%1995
Wood ThrushTurdidae82024+300%2009
Yellow-billed CuckooCuculidae72024+114%1995
Eastern Wood-PeweeTyrannidae72024+133%1995
Grasshopper SparrowPasserellidae72024-67%1995
Eurasian Tree SparrowPasseridae72024+67%2000
Downy WoodpeckerPicidae62024+67%2000
Cedar WaxwingBombycillidae62024-23%1996
Chimney SwiftApodidae52024+25%1995
American GoldfinchFringillidae52024-53%1995
Northern BobwhiteOdontophoridae42024-90%1995
Horned LarkAlaudidae42024-82%1995
Eastern BluebirdTurdidae42024-65%1995
American KestrelFalconidae42024+140%1997
Blue GrosbeakCardinalidae42024+0%2021
Eastern PhoebeTyrannidae32024+100%1997
Chipping SparrowPasserellidae32024+90%1995

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