BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Drehersville Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 101 species recorded across 34 survey years, no longer active.

101Species 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 →
34Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–1999Span
5Observers

Bird Species Found on Pennsylvania Drehersville

Top 40 of 101 species by most recent count. Each links to its species trend.

Species recorded on the Drehersville 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
European StarlingSturnidae1601999+123%1968
Common GrackleIcteridae1171999-39%1968
House SparrowPasseridae1021999+50%1968
Red-winged BlackbirdIcteridae881999-3%1968
American RobinTurdidae651999+11%1968
Mourning DoveColumbidae631999+162%1968
Barn SwallowHirundinidae601999+236%1968
American CrowCorvidae531999+167%1968
Canada GooseAnatidae501999+183%1982
Song SparrowPasserellidae351999+164%1968
American GoldfinchFringillidae341999+131%1968
Chipping SparrowPasserellidae301999+252%1968
Northern CardinalCardinalidae251999+430%1968
Gray CatbirdMimidae251999+154%1968
Indigo BuntingCardinalidae151999+120%1968
Northern House WrenTroglodytidae151999-30%1968
Brown-headed CowbirdIcteridae131999+256%1968
Eastern PhoebeTyrannidae121999+109%1968
Common YellowthroatParulidae121999+87%1968
Field SparrowPasserellidae111999+50%1968
Rock PigeonColumbidae111999-69%1969
House FinchFringillidae11199923×1974
Tree SwallowHirundinidae111998+475%1986
MallardAnatidae101999+47%1968
Blue JayCorvidae101999+66%1968
Wood ThrushTurdidae81999-36%1968
Yellow WarblerParulidae81999+300%1969
Ring-necked PheasantPhasianidae61999-69%1968
Willow FlycatcherTyrannidae61999+160%1969
Downy WoodpeckerPicidae61999+71%1969
Red-eyed VireoVireonidae51999-40%1968
American KestrelFalconidae51999+117%1969
Northern Rough-winged SwallowHirundinidae51999+133%1980
Red-bellied WoodpeckerPicidae51999+300%1985
Baltimore OrioleIcteridae41999-78%1968
Scarlet TanagerCardinalidae41999+57%1968
Northern MockingbirdMimidae41999+7%1968
Great Blue HeronArdeidae41998+200%1989
KilldeerCharadriidae31999+146%1968
Great Crested FlycatcherTyrannidae31999-41%1968

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