BirdAnalyst
BBS Route · Illinois · BCR 22

Stillwell Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 98 species recorded across 49 survey years, still active.

98Species 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 →
49Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1971–2025Span
4Observers

Bird Species Found on Illinois Stillwell

Top 40 of 98 species by most recent count. Each links to its species trend.

Species recorded on the Stillwell 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 BlackbirdIcteridae2022025+25%1977
DickcisselCardinalidae782025+201%1977
American RobinTurdidae582025+151%1977
Mourning DoveColumbidae552025+33%1977
KilldeerCharadriidae39202536×1977
Brown-headed CowbirdIcteridae392025+476%1977
Barn SwallowHirundinidae322025+45%1977
European StarlingSturnidae302025-35%1977
Indigo BuntingCardinalidae292025+200%1977
House SparrowPasseridae282025-85%1977
Eastern MeadowlarkIcteridae262025-32%1977
American CrowCorvidae222025+61%1977
Gray CatbirdMimidae202025+333%1977
Northern CardinalCardinalidae192025+197%1977
Canada GooseAnatidae192017+90%2000
Common YellowthroatParulidae152025+221%1977
Common GrackleIcteridae122025-69%1977
Eastern KingbirdTyrannidae112025+124%1977
Chipping SparrowPasserellidae112025+725%1982
Song SparrowPasserellidae112025+75%1977
Northern BobwhiteOdontophoridae92025-81%1977
American GoldfinchFringillidae92025+74%1977
Northern House WrenTroglodytidae92025+87%1977
Eurasian Collared-DoveColumbidae92025+80%2005
Orchard OrioleIcteridae82025+367%1980
Wood DuckAnatidae82017+150%1994
Cliff SwallowHirundinidae82025+243%1993
Field SparrowPasserellidae72025-22%1977
Warbling VireoVireonidae62025+325%1979
Brown ThrasherMimidae62025-15%1977
Eastern Wood-PeweeTyrannidae62025+675%1983
Downy WoodpeckerPicidae52025+325%1980
Chimney SwiftApodidae52023-85%1977
Purple MartinHirundinidae52023-76%1977
Blue JayCorvidae42025-36%1977
Vesper SparrowPasserellidae42023+20%1982
Rock PigeonColumbidae42025-69%1979
White-breasted NuthatchSittidae42023+20%1982
Wood ThrushTurdidae42025+300%2018
Cedar WaxwingBombycillidae42025+25%1988

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