BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Big Flat Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 94 species recorded across 14 survey years, no longer active.

94Species 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 →
14Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–1981Span
4Observers

Bird Species Found on Pennsylvania Big Flat

Top 40 of 94 species by most recent count. Each links to its species trend.

Species recorded on the Big Flat 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
House SparrowPasseridae1491981+175%1968
Common GrackleIcteridae1261981-6%1968
American RobinTurdidae711981+85%1968
European StarlingSturnidae591981-15%1968
Mourning DoveColumbidae581981+183%1968
Red-winged BlackbirdIcteridae541981+31%1968
Barn SwallowHirundinidae441981+184%1968
Song SparrowPasserellidae361981+707%1968
Chipping SparrowPasserellidae351981+667%1968
Brown-headed CowbirdIcteridae341981+89%1968
American CrowCorvidae281981+94%1968
Eastern TowheePasserellidae251981+192%1968
Northern CardinalCardinalidae211981+247%1968
Wood ThrushTurdidae211981+49%1968
Cedar WaxwingBombycillidae191981+108%1978
Ring-necked PheasantPhasianidae181981+257%1968
OvenbirdParulidae161981+193%1975
Baltimore OrioleIcteridae151981+900%1974
American GoldfinchFringillidae151981+475%1968
Eastern Wood-PeweeTyrannidae131981+329%1968
Common YellowthroatParulidae131981+600%1970
House FinchFringillidae131981+163%1979
Blue JayCorvidae121981+14%1968
Chimney SwiftApodidae111981-13%1968
Eastern MeadowlarkIcteridae111981+5%1968
Indigo BuntingCardinalidae111981+400%1968
Gray CatbirdMimidae111981+241%1968
Northern House WrenTroglodytidae111981+29%1968
Rock PigeonColumbidae111981-7%1970
Canada GooseAnatidae111976+38%1975
Black-billed CuckooCuculidae11198111×1975
Yellow-billed CuckooCuculidae101981+867%1970
Red-eyed VireoVireonidae101981+129%1968
Tufted TitmouseParidae101981+146%1968
Field SparrowPasserellidae91981+93%1968
Black-capped ChickadeeParidae81981+167%1978
Great Crested FlycatcherTyrannidae71981+100%1971
Northern MockingbirdMimidae71981-13%1968
Scarlet TanagerCardinalidae61981+400%1968
KilldeerCharadriidae51980+200%1970

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