BirdAnalyst
BBS Route · Illinois · BCR 22

Duncan Mills Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 93 species recorded across 32 survey years, still active.

93Species 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 →
32Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1993–2025Span
3Observers

Bird Species Found on Illinois Duncan Mills

Top 40 of 93 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 BlackbirdIcteridae1872025-1%1995
American RobinTurdidae852025+184%1995
Mourning DoveColumbidae642025+154%1995
DickcisselCardinalidae502025+9%1995
Eastern MeadowlarkIcteridae352025-31%1995
Indigo BuntingCardinalidae322025+20%1995
European StarlingSturnidae242025+130%1995
House SparrowPasseridae222025-37%1995
KilldeerCharadriidae212025+77%1995
Red-bellied WoodpeckerPicidae202025+12%1995
Barn SwallowHirundinidae192025-51%1995
Northern CardinalCardinalidae172025+47%1995
Brown-headed CowbirdIcteridae162025+119%1995
Common YellowthroatParulidae152025+52%1995
American CrowCorvidae142025-53%1995
Chipping SparrowPasserellidae142025+150%1995
Northern House WrenTroglodytidae142025+95%1995
Eastern Wood-PeweeTyrannidae122025+167%1995
Rock PigeonColumbidae122025+170%1998
Eastern KingbirdTyrannidae122025+429%1997
Red-headed WoodpeckerPicidae112025+425%1995
Turkey VultureCathartidae112025+250%2000
Northern BobwhiteOdontophoridae72025-91%1995
Song SparrowPasserellidae72025-83%1995
Purple MartinHirundinidae72025+314%2001
Blue GrosbeakCardinalidae72025+25%2021
American GoldfinchFringillidae62025-37%1995
Warbling VireoVireonidae62025+775%1996
Gray CatbirdMimidae62025+175%1995
Brown ThrasherMimidae62025-42%1995
Baltimore OrioleIcteridae62025-9%1996
Chimney SwiftApodidae52025+25%1995
Great Crested FlycatcherTyrannidae52025+10%1995
Eastern PhoebeTyrannidae52025+133%1997
Horned LarkAlaudidae52025-86%1995
Carolina WrenTroglodytidae52025-13%2002
Downy WoodpeckerPicidae42025+100%2000
Common GrackleIcteridae42025-52%1995
Cedar WaxwingBombycillidae42025-8%1996
Tufted TitmouseParidae42025-63%1995

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