BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Duvall Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 99 species recorded across 44 survey years, still active.

99Species 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 →
44Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1974–2021Span
3Observers

Bird Species Found on Pennsylvania Duvall

Top 40 of 99 species by most recent count. Each links to its species trend.

Species recorded on the Duvall 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 RobinTurdidae1272021+82%1976
Red-winged BlackbirdIcteridae852021-22%1976
Red-eyed VireoVireonidae512021+193%1976
Yellow WarblerParulidae372021+49%1976
Tufted TitmouseParidae372021-15%1976
Northern CardinalCardinalidae332021-26%1976
Common YellowthroatParulidae312021-8%1976
Song SparrowPasserellidae302021-46%1976
Eastern TowheePasserellidae292021+9%1976
American CrowCorvidae272021-53%1976
Gray CatbirdMimidae272021+76%1976
Red-bellied WoodpeckerPicidae232021+136%1976
Wood ThrushTurdidae212021+6%1976
Blue JayCorvidae192021+267%1978
European StarlingSturnidae192021-49%1976
Field SparrowPasserellidae192021-82%1976
Rose-breasted GrosbeakCardinalidae192021+575%1980
American RedstartParulidae182021+314%1979
Eastern Wood-PeweeTyrannidae132021-57%1976
House SparrowPasseridae122021-79%1976
White-breasted NuthatchSittidae122021+42%1978
Eastern PhoebeTyrannidae102021+25%1976
Barn SwallowHirundinidae102021-35%1976
Mourning DoveColumbidae92021+58%1976
Indigo BuntingCardinalidae92021-82%1976
Scarlet TanagerCardinalidae92021-13%1976
Downy WoodpeckerPicidae82021-55%1976
American GoldfinchFringillidae82021-77%1976
Carolina ChickadeeParidae82021+0%1977
Rock PigeonColumbidae72017-61%1987
Chimney SwiftApodidae62021-20%1976
Common GrackleIcteridae62021-67%1976
Cedar WaxwingBombycillidae62021+86%1981
Wild TurkeyPhasianidae62021+20%1999
Northern House WrenTroglodytidae52021-79%1976
Blue-winged WarblerParulidae52021+17%1977
Bank SwallowHirundinidae51984+400%1982
Acadian FlycatcherTyrannidae42021-41%1976
Brown-headed CowbirdIcteridae42021-80%1976
Eastern MeadowlarkIcteridae42021-78%1976

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