BirdAnalyst
BBS Route · Illinois · BCR 24

Delwood Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 108 species recorded across 50 survey years, still active.

108Species 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 →
50Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1970–2025Span
11Observers

Bird Species Found on Illinois Delwood

Top 40 of 108 species by most recent count. Each links to its species trend.

Species recorded on the Delwood 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
American CrowCorvidae712025+89%1972
Northern CardinalCardinalidae452025+56%1972
Indigo BuntingCardinalidae402025+23%1972
Tufted TitmouseParidae402025+197%1972
Purple MartinHirundinidae282025+45%1972
Red-bellied WoodpeckerPicidae262025+13%1972
Common YellowthroatParulidae262025+128%1972
Wood ThrushTurdidae262025+127%1972
White-eyed VireoVireonidae232025+219%1972
European StarlingSturnidae212025-7%1972
Mourning DoveColumbidae192025-70%1972
Yellow-breasted ChatIcteriidae192025+15%1972
Brown-headed CowbirdIcteridae182025+186%1972
Chimney SwiftApodidae172025-45%1972
Red-winged BlackbirdIcteridae172025-66%1972
American RobinTurdidae172025-24%1972
Eastern Wood-PeweeTyrannidae162025+14%1972
Eastern MeadowlarkIcteridae162025-71%1972
Eastern TowheePasserellidae162025-45%1972
American GoldfinchFringillidae152025+113%1972
House SparrowPasseridae142025-63%1972
Chipping SparrowPasserellidae132025+364%1972
Blue JayCorvidae122025-44%1972
Barn SwallowHirundinidae122025-80%1972
Kentucky WarblerParulidae122025+220%1972
White-breasted NuthatchSittidae122025+700%1974
Eastern BluebirdTurdidae122025+141%1972
Prairie WarblerParulidae122025+114%1975
Great Crested FlycatcherTyrannidae112025+35%1972
Cliff SwallowHirundinidae112024-27%1990
Eastern KingbirdTyrannidae102025+41%1972
Acadian FlycatcherTyrannidae102025+525%1976
Brown ThrasherMimidae92025-21%1972
Northern BobwhiteOdontophoridae82025-84%1972
Field SparrowPasserellidae82025-52%1972
Red-eyed VireoVireonidae82025+225%1974
Turkey VultureCathartidae82025+140%1974
Carolina WrenTroglodytidae82025+73%1974
Blue-gray GnatcatcherPolioptilidae82025+158%1977
Northern ParulaParulidae82025+800%1984

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