BirdAnalyst
BBS Route · Oklahoma · BCR 21

Duncan Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 100 species recorded across 32 survey years, still active.

100Species 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 →
32Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1986–2024Span
5Observers

Bird Species Found on Oklahoma Duncan

Top 40 of 100 species by most recent count. Each links to its species trend.

Species recorded on the Duncan 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
DickcisselCardinalidae632024+89%1988
Cliff SwallowHirundinidae582024-6%1993
Northern CardinalCardinalidae412024+57%1988
Mourning DoveColumbidae382024+13%1988
Northern MockingbirdMimidae362024+54%1988
Eastern MeadowlarkIcteridae352024-63%1988
Scissor-tailed FlycatcherTyrannidae312024-4%1988
Turkey VultureCathartidae262024+463%1988
American CrowCorvidae242024+4%1988
Brown-headed CowbirdIcteridae192024+148%1990
European StarlingSturnidae152023-41%1991
Painted BuntingCardinalidae132024+40%1988
Carolina ChickadeeParidae132024+630%1988
Lark SparrowPasserellidae122024+4%1988
Yellow-billed CuckooCuculidae102024+38%1988
Carolina WrenTroglodytidae102024+144%2000
House SparrowPasseridae92024+37%1988
Bewick's WrenTroglodytidae92024+20%1990
Northern BobwhiteOdontophoridae82024-88%1988
Field SparrowPasserellidae72024+164%1988
Barn SwallowHirundinidae72024-38%1988
Common NighthawkCaprimulgidae62024-5%1988
Common GrackleIcteridae62024-84%1988
KilldeerCharadriidae52024-21%1988
Eastern PhoebeTyrannidae52024+110%1990
Red-winged BlackbirdIcteridae52024-71%1988
Eastern BluebirdTurdidae52024+125%1988
Canada GooseAnatidae52021+47%1994
Blue-gray GnatcatcherPolioptilidae52024-24%1993
Eurasian Collared-DoveColumbidae52024+39%2017
Blue JayCorvidae42023-14%1994
Blue GrosbeakCardinalidae42024+83%1997
Chimney SwiftApodidae42021-25%1994
Downy WoodpeckerPicidae42024+160%1998
Western MeadowlarkIcteridae42017+117%1993
Indigo BuntingCardinalidae42024+200%2006
Purple MartinHirundinidae42019-65%1995
Red-tailed HawkAccipitridae32024+75%1988
Northern Rough-winged SwallowHirundinidae32021+120%1997
Great Blue HeronArdeidae32024+133%1991

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