BirdAnalyst
BBS Route · Missouri · BCR 22

Trenton Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 111 species recorded across 42 survey years, still active.

111Species 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 →
42Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1967–2025Span
12Observers

Bird Species Found on Missouri Trenton

Top 40 of 111 species by most recent count. Each links to its species trend.

Species recorded on the Trenton 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 BlackbirdIcteridae782025-33%1969
Cliff SwallowHirundinidae76202514×2007
DickcisselCardinalidae592025+38%1969
American RobinTurdidae462025+61%1969
Barn SwallowHirundinidae412025+86%1969
Northern CardinalCardinalidae392025+107%1969
Northern BobwhiteOdontophoridae372025-45%1969
European StarlingSturnidae312025-61%1969
Brown-headed CowbirdIcteridae272025+207%1969
Eastern MeadowlarkIcteridae272025-16%1969
Red-headed WoodpeckerPicidae232025+183%1969
American CrowCorvidae212025+285%1969
Mourning DoveColumbidae202025+11%1969
Indigo BuntingCardinalidae202025+135%1972
Turkey VultureCathartidae202025+475%1977
American GoldfinchFringillidae192025-16%1969
Field SparrowPasserellidae192025+14%1969
Rose-breasted GrosbeakCardinalidae182025+720%1969
Common YellowthroatParulidae172025+107%1969
Horned LarkAlaudidae162025+50%1975
Orchard OrioleIcteridae162025+750%1975
Eastern KingbirdTyrannidae152025+76%1969
Purple MartinHirundinidae13202512×1985
KilldeerCharadriidae122025+500%1972
Gray CatbirdMimidae122025+52%1969
Northern House WrenTroglodytidae122025+59%1969
Blue JayCorvidae112025+24%1969
Eastern BluebirdTurdidae112025+45%1969
MallardAnatidae112021+175%2009
Common GrackleIcteridae92025-65%1972
House SparrowPasseridae92025-83%1969
Brown ThrasherMimidae92025+18%1969
BobolinkIcteridae82025-35%1976
Eastern PhoebeTyrannidae72025+38%1976
Great Crested FlycatcherTyrannidae72025+42%1972
Blue GrosbeakCardinalidae72025+200%1977
Eastern Wood-PeweeTyrannidae62025+229%1975
Tufted TitmouseParidae62025+50%1972
Red-bellied WoodpeckerPicidae52025+111%1972
Black-capped ChickadeeParidae52022-9%1972

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