BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Drehersville 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 96 species recorded across 21 survey years, still active.

96Species 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 →
21Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2000–2025Span
1Observers

Bird Species Found on Pennsylvania Drehersville 2

Top 40 of 96 species by most recent count. Each links to its species trend.

Species recorded on the Drehersville 2 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
Common GrackleIcteridae1042025-68%2002
Red-winged BlackbirdIcteridae722025-52%2002
European StarlingSturnidae672025-69%2002
American RobinTurdidae602025+6%2002
House SparrowPasseridae572025-76%2002
Gray CatbirdMimidae472025+35%2002
Barn SwallowHirundinidae422025-31%2002
Mourning DoveColumbidae412025-39%2002
Rock PigeonColumbidae402025-26%2002
American CrowCorvidae302025-28%2002
Northern CardinalCardinalidae292025-2%2002
Blue JayCorvidae282025+7%2002
Song SparrowPasserellidae232025-18%2002
Chipping SparrowPasserellidae222025-36%2002
Wood ThrushTurdidae202025+85%2002
Brown-headed CowbirdIcteridae192025-25%2002
House FinchFringillidae192025+15%2002
Northern House WrenTroglodytidae192025+41%2002
Northern MockingbirdMimidae182025+7%2002
Carolina WrenTroglodytidae182025+229%2002
Fish CrowCorvidae18202516×2008
Red-bellied WoodpeckerPicidae162025+233%2002
Cedar WaxwingBombycillidae162025+24%2003
Red-eyed VireoVireonidae162025+48%2002
American GoldfinchFringillidae152025-36%2002
OvenbirdParulidae152025+113%2002
Indigo BuntingCardinalidae142025-31%2002
Eastern Wood-PeweeTyrannidae132025+467%2003
Turkey VultureCathartidae122025-6%2007
Downy WoodpeckerPicidae122025+105%2002
Eastern PhoebeTyrannidae112025+39%2002
Willow FlycatcherTyrannidae112025+93%2002
Common YellowthroatParulidae102025-14%2002
Chimney SwiftApodidae92025+100%2003
Eastern KingbirdTyrannidae92025+0%2002
Great Crested FlycatcherTyrannidae92025+60%2003
Field SparrowPasserellidae82025-10%2002
Yellow WarblerParulidae82025-60%2002
Carolina ChickadeeParidae82025-17%2017
Warbling VireoVireonidae72025+367%2008

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