BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Drehersville 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 95 species recorded across 20 survey years, still active.

95Species 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 →
20Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2000–2024Span
1Observers

Bird Species Found on Pennsylvania Drehersville 2

Top 40 of 95 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
European StarlingSturnidae2532024-66%2002
Common GrackleIcteridae1232024-71%2002
House SparrowPasseridae1052024-72%2002
Rock PigeonColumbidae982024-13%2002
American RobinTurdidae902024+15%2002
Red-winged BlackbirdIcteridae722024-61%2002
Gray CatbirdMimidae652024+21%2002
Mourning DoveColumbidae632024-17%2002
American CrowCorvidae632024-29%2002
Barn SwallowHirundinidae632024-24%2002
Northern CardinalCardinalidae472024+18%2002
Canada GooseAnatidae402024+120%2002
Song SparrowPasserellidae362024-14%2002
American GoldfinchFringillidae302024-27%2002
House FinchFringillidae282024+77%2002
Wood ThrushTurdidae222024+59%2002
Chipping SparrowPasserellidae192024-27%2002
Northern MockingbirdMimidae192024+4%2002
Northern House WrenTroglodytidae182024+41%2002
Fish CrowCorvidae18202418×2008
Carolina WrenTroglodytidae172024+193%2002
Field SparrowPasserellidae162024-7%2002
Indigo BuntingCardinalidae162024-25%2002
Downy WoodpeckerPicidae142024+195%2002
Blue JayCorvidae142024+24%2002
Eastern Wood-PeweeTyrannidae142024+433%2003
Common YellowthroatParulidae132024-9%2002
Red-bellied WoodpeckerPicidae112024+283%2002
Eastern PhoebeTyrannidae112024+91%2002
Red-eyed VireoVireonidae102024+15%2002
OvenbirdParulidae102024+63%2002
Cedar WaxwingBombycillidae92024+21%2003
Eastern BluebirdTurdidae92024+148%2002
Eastern KingbirdTyrannidae82024-5%2002
Baltimore OrioleIcteridae82023+57%2002
Brown-headed CowbirdIcteridae72024-6%2002
Black VultureCathartidae72021+300%2013
Willow FlycatcherTyrannidae62024+64%2002
Scarlet TanagerCardinalidae62024+71%2002
Brown ThrasherMimidae62024+375%2010

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