BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Clear Spring Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 113 species recorded across 54 survey years, still active.

113Species 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 →
54Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2025Span
8Observers

Bird Species Found on Pennsylvania Clear Spring

Top 40 of 113 species by most recent count. Each links to its species trend.

Species recorded on the Clear Spring 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 StarlingSturnidae812025+4%1968
American RobinTurdidae672025+13%1968
Northern CardinalCardinalidae462025+310%1968
Red-eyed VireoVireonidae392025+231%1968
Gray CatbirdMimidae242025+111%1968
Eastern Wood-PeweeTyrannidae212025+75%1968
Chipping SparrowPasserellidae212025+38%1968
American GoldfinchFringillidae202025-9%1968
House SparrowPasseridae202025-91%1968
Barn SwallowHirundinidae182025-15%1968
Northern MockingbirdMimidae172025+46%1968
Mourning DoveColumbidae162025-17%1968
Common GrackleIcteridae142025-89%1968
Northern House WrenTroglodytidae142025-34%1968
Red-winged BlackbirdIcteridae132025-75%1968
Wood ThrushTurdidae132025+48%1968
Carolina WrenTroglodytidae12202512×1975
American CrowCorvidae112025-53%1968
OvenbirdParulidae112025+105%1968
Carolina ChickadeeParidae112025+343%1996
Song SparrowPasserellidae92025-34%1968
Tufted TitmouseParidae92025+62%1968
Downy WoodpeckerPicidae82025+114%1968
Brown-headed CowbirdIcteridae82025-7%1968
Purple MartinHirundinidae82025-45%1973
Hooded WarblerParulidae82025+175%2007
Acadian FlycatcherTyrannidae72025+80%1968
Blue JayCorvidae72025-25%1968
Field SparrowPasserellidae72025+7%1968
House FinchFringillidae72025+33%1982
Indigo BuntingCardinalidae62025+43%1968
Black-capped ChickadeeParidae62015+0%1968
Eastern BluebirdTurdidae62025+260%1989
Scarlet TanagerCardinalidae52025-30%1968
Cedar WaxwingBombycillidae52025+143%1980
Red-bellied WoodpeckerPicidae52025+533%1972
Pine WarblerParulidae52025+140%1995
Northern BobwhiteOdontophoridae42000-81%1968
Eastern TowheePasserellidae42025-86%1968
Common YellowthroatParulidae42025-10%1968

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