BirdAnalyst
BBS Route · Illinois · BCR 22

Troy Grove Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 91 species recorded across 28 survey years, still active.

91Species 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 →
28Years 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
2Observers

Bird Species Found on Illinois Troy Grove

Top 40 of 91 species by most recent count. Each links to its species trend.

Species recorded on the Troy Grove 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 BlackbirdIcteridae2372025+6%1995
American RobinTurdidae1002025+37%1995
Common GrackleIcteridae732025-24%1995
House SparrowPasseridae602025-35%1995
Brown-headed CowbirdIcteridae292025+103%1995
KilldeerCharadriidae232025+132%1995
European StarlingSturnidae202025-64%1995
Barn SwallowHirundinidae202025+31%1995
Rock PigeonColumbidae162025-51%1995
Mourning DoveColumbidae152025-26%1995
Northern House WrenTroglodytidae152025+243%1996
Eastern MeadowlarkIcteridae142025+185%1995
Northern CardinalCardinalidae132025+12%1995
Vesper SparrowPasserellidae102025-40%1995
Song SparrowPasserellidae82025-69%1995
American GoldfinchFringillidae72025+0%1995
MallardAnatidae62019+75%1996
Western MeadowlarkIcteridae62025-89%1995
Cliff SwallowHirundinidae62025+120%1995
Savannah SparrowPasserellidae62012+267%1998
Wood DuckAnatidae52015+133%2001
American CrowCorvidae52025-72%1995
Common YellowthroatParulidae52025+58%1996
Purple MartinHirundinidae52021+400%2013
Chipping SparrowPasserellidae42025-39%1996
Warbling VireoVireonidae42025+100%1996
House FinchFringillidae42025-46%1996
Hooded MerganserAnatidae42018n/an/a
Chimney SwiftApodidae32025-67%1995
DickcisselCardinalidae32025+183%1995
Brown ThrasherMimidae32025-38%1995
Bank SwallowHirundinidae32005n/an/a
Eurasian Collared-DoveColumbidae32025-38%2013
Orchard OrioleIcteridae32023+100%2012
Wild TurkeyPhasianidae32016n/an/a
Ring-necked PheasantPhasianidae22011-90%1995
Blue JayCorvidae22025+14%1996
Rose-breasted GrosbeakCardinalidae22025-20%1997
Gray CatbirdMimidae22025+0%1995
Eastern BluebirdTurdidae22007+25%2000

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