BirdAnalyst
BBS Route · Illinois · BCR 22

Nilwood Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 89 species recorded across 30 survey years, still active.

89Species 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 →
30Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1993–2023Span
1Observers

Bird Species Found on Illinois Nilwood

Top 40 of 89 species by most recent count. Each links to its species trend.

Species recorded on the Nilwood 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 BlackbirdIcteridae782023-27%1995
American RobinTurdidae492023-17%1995
European StarlingSturnidae392023+69%1995
Mourning DoveColumbidae242023+23%1995
American CrowCorvidae242023+114%1995
Double-crested CormorantPhalacrocoracidae231995n/an/a
Canada GooseAnatidae212021-40%1999
Common GrackleIcteridae152023-69%1995
Turkey VultureCathartidae142023+214%2002
Horned LarkAlaudidae132023-91%1995
Indigo BuntingCardinalidae132023-18%1995
KilldeerCharadriidae122023+0%1995
House SparrowPasseridae92023-92%1995
Northern CardinalCardinalidae82023+97%1995
DickcisselCardinalidae82023-59%1995
Northern BobwhiteOdontophoridae72023-85%1995
Rock PigeonColumbidae62019+183%1996
Barn SwallowHirundinidae52023+33%1995
Warbling VireoVireonidae52022+50%1997
Northern House WrenTroglodytidae52023+43%1995
Eastern MeadowlarkIcteridae42022-86%1995
Chipping SparrowPasserellidae42022+86%1995
Song SparrowPasserellidae42023-73%1995
Ring-necked PheasantPhasianidae32019-25%1995
Red-bellied WoodpeckerPicidae32023+46%1995
Eastern KingbirdTyrannidae32019+40%1995
Rose-breasted GrosbeakCardinalidae32022+67%1997
Brown ThrasherMimidae32023-57%1995
Eurasian Collared-DoveColumbidae32023+5%2012
American KestrelFalconidae22019-20%1996
Yellow-billed CuckooCuculidae22022+0%1996
Eastern Wood-PeweeTyrannidae22018+33%1995
Blue JayCorvidae22022-50%1995
Baltimore OrioleIcteridae22023-40%1996
American GoldfinchFringillidae22023-23%1995
Grasshopper SparrowPasserellidae22015-70%1995
Eurasian Tree SparrowPasseridae22005-50%1995
Tufted TitmouseParidae22023-33%1995
Black-capped ChickadeeParidae22017+25%1995
Great Blue HeronArdeidae22022+25%1996

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