BirdAnalyst
BBS Route · Oklahoma · BCR 21

Duncan Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 100 species recorded across 33 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 →
33Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1986–2025Span
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
Cliff SwallowHirundinidae662025-12%1993
DickcisselCardinalidae482025+61%1988
Mourning DoveColumbidae452025+49%1988
Eastern MeadowlarkIcteridae422025-62%1988
Northern MockingbirdMimidae392025+68%1988
Scissor-tailed FlycatcherTyrannidae312025-11%1988
Northern CardinalCardinalidae292025+37%1988
American CrowCorvidae242025-2%1988
Brown-headed CowbirdIcteridae222025+164%1990
Painted BuntingCardinalidae202025+53%1988
Lark SparrowPasserellidae132025+25%1988
Bewick's WrenTroglodytidae132025+130%1990
Turkey VultureCathartidae122025+413%1988
Common NighthawkCaprimulgidae112025+14%1988
European StarlingSturnidae112025-29%1991
Yellow-billed CuckooCuculidae102025+9%1988
Red-bellied WoodpeckerPicidae102025-35%1988
Black VultureCathartidae102025+525%2012
Tufted TitmouseParidae82025+213%1990
Eastern BluebirdTurdidae72025+200%1988
Carolina WrenTroglodytidae72025+167%2000
Field SparrowPasserellidae62025+127%1988
Carolina ChickadeeParidae62025+420%1988
Northern BobwhiteOdontophoridae52025-90%1988
Eastern PhoebeTyrannidae52025+80%1990
Mississippi KiteAccipitridae52025-8%1991
Canada GooseAnatidae52021+47%1994
Indigo BuntingCardinalidae52025+160%2006
Blue-gray GnatcatcherPolioptilidae52025-18%1993
Eurasian Collared-DoveColumbidae52025+39%2017
House SparrowPasseridae42025+7%1988
Chimney SwiftApodidae42021-25%1994
Western MeadowlarkIcteridae42017+117%1993
Purple MartinHirundinidae42019-65%1995
White-eyed VireoVireonidae42025+17%2006
KilldeerCharadriidae32025-21%1988
Blue JayCorvidae32025+14%1994
Red-winged BlackbirdIcteridae32025-79%1988
Blue GrosbeakCardinalidae32025+67%1997
Northern Rough-winged SwallowHirundinidae32021+120%1997

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