BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Williamsburg Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 112 species recorded across 36 survey years, still active.

112Species 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 →
36Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1988–2024Span
2Observers

Bird Species Found on Pennsylvania Williamsburg

Top 40 of 112 species by most recent count. Each links to its species trend.

Species recorded on the Williamsburg 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 GrackleIcteridae1112024+79%1990
European StarlingSturnidae1032024-42%1990
American RobinTurdidae812024+156%1990
American CrowCorvidae552024-18%1990
Rock PigeonColumbidae462024-41%1990
Red-winged BlackbirdIcteridae382024-46%1990
Barn SwallowHirundinidae342024-5%1990
Mourning DoveColumbidae332024+6%1990
Song SparrowPasserellidae292024-33%1990
House SparrowPasseridae252024-48%1990
Red-eyed VireoVireonidae232024+200%1990
OvenbirdParulidae162024+29%1990
KilldeerCharadriidae152024-7%1990
American GoldfinchFringillidae142024+30%1990
Chipping SparrowPasserellidae142024-51%1990
Eastern TowheePasserellidae142024-36%1990
Eastern BluebirdTurdidae142024+21%1990
Northern House WrenTroglodytidae132024+60%1990
House FinchFringillidae122024+43%1990
Gray CatbirdMimidae122024+0%1990
Carolina WrenTroglodytidae112024+420%2001
Northern CardinalCardinalidae102024-40%1990
Indigo BuntingCardinalidae102024-38%1990
Scarlet TanagerCardinalidae102024+0%1990
MallardAnatidae82024-42%1990
Red-bellied WoodpeckerPicidae82024+460%1990
Tufted TitmouseParidae82024+28%1990
Turkey VultureCathartidae72024-17%1991
Northern MockingbirdMimidae72024+129%1993
Wild TurkeyPhasianidae62023+60%1994
Purple MartinHirundinidae62024+8%2015
Brown-headed CowbirdIcteridae52024-31%1990
Field SparrowPasserellidae52024-74%1990
Common YellowthroatParulidae52024-70%1990
Horned LarkAlaudidae52024+30%1994
Red-tailed HawkAccipitridae42023+20%1993
Eastern MeadowlarkIcteridae42024-74%1990
Cedar WaxwingBombycillidae42024+0%1990
Wood ThrushTurdidae42024-44%1990
Great Horned OwlStrigidae32006+233%1998

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