BirdAnalyst
BBS Route · Illinois · BCR 22

Gridley Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 85 species recorded across 19 survey years, still active.

85Species 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 →
19Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2001–2025Span
5Observers

Bird Species Found on Illinois Gridley

Top 40 of 85 species by most recent count. Each links to its species trend.

Species recorded on the Gridley 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
Common GrackleIcteridae1682025-20%2006
Red-winged BlackbirdIcteridae1012025-38%2006
European StarlingSturnidae902025-34%2006
American RobinTurdidae642025-62%2006
House SparrowPasseridae522025-39%2006
Mourning DoveColumbidae422025-44%2006
Barn SwallowHirundinidae392025-34%2006
Brown-headed CowbirdIcteridae362025-14%2006
DickcisselCardinalidae342025+254%2006
American CrowCorvidae242025+18%2006
KilldeerCharadriidae212025-5%2006
Eastern MeadowlarkIcteridae202025-9%2006
Indigo BuntingCardinalidae152025-38%2006
Chipping SparrowPasserellidae132025-64%2006
Northern House WrenTroglodytidae112025-28%2006
Vesper SparrowPasserellidae102025-53%2006
Northern CardinalCardinalidae102025-27%2006
Canada GooseAnatidae102025-74%2011
Tree SwallowHirundinidae102024+133%2011
Cliff SwallowHirundinidae92025+138%2010
Turkey VultureCathartidae82024+233%2017
Horned LarkAlaudidae72025-88%2006
Red-bellied WoodpeckerPicidae62025+38%2006
Eurasian Collared-DoveColumbidae62025+86%2017
Common YellowthroatParulidae52025+7%2006
Ring-necked PheasantPhasianidae42025-57%2006
Chimney SwiftApodidae42025-32%2006
Blue JayCorvidae42025-56%2006
Field SparrowPasserellidae32025+67%2006
Eastern TowheePasserellidae32021+150%2007
Brown ThrasherMimidae32021+13%2007
MallardAnatidae32022+0%2009
Common NighthawkCaprimulgidae32010+200%2006
Great Blue HeronArdeidae22025+175%2006
Green HeronArdeidae22014+0%2010
American KestrelFalconidae22024-50%2007
Downy WoodpeckerPicidae22025-17%2007
Eastern KingbirdTyrannidae22024+20%2006
Eastern Wood-PeweeTyrannidae22025+75%2006
Song SparrowPasserellidae22025-78%2006

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