BirdAnalyst
BBS Route · Pennsylvania · BCR 29

Chatham Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 92 species recorded across 23 survey years, still active.

92Species 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 →
23Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1997–2024Span
4Observers

Bird Species Found on Pennsylvania Chatham

Top 40 of 92 species by most recent count. Each links to its species trend.

Species recorded on the Chatham 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 StarlingSturnidae1042024-6%1999
American RobinTurdidae782024-28%1999
Song SparrowPasserellidae502024+95%1999
Gray CatbirdMimidae482024+198%1999
Chipping SparrowPasserellidae462024+119%1999
Barn SwallowHirundinidae362024+172%1999
Mourning DoveColumbidae262024+19%1999
Common GrackleIcteridae262024-49%1999
Red-winged BlackbirdIcteridae232024-62%1999
Carolina WrenTroglodytidae212024+614%1999
Northern CardinalCardinalidae202024+55%1999
Red-bellied WoodpeckerPicidae182024+176%1999
Brown-headed CowbirdIcteridae162024+231%1999
House FinchFringillidae162024+83%1999
House SparrowPasseridae162024-58%1999
Northern MockingbirdMimidae162024-30%1999
Northern House WrenTroglodytidae152024+27%1999
Chimney SwiftApodidae142024+8%1999
Eastern Wood-PeweeTyrannidae142024+28%1999
Blue JayCorvidae112024+31%1999
American CrowCorvidae112024-52%1999
American GoldfinchFringillidae112024+15%1999
Downy WoodpeckerPicidae92024+550%2000
Indigo BuntingCardinalidae92024+3%1999
Eastern PhoebeTyrannidae82024+56%2001
Turkey VultureCathartidae72024-63%1999
Eastern KingbirdTyrannidae72024+109%1999
Common YellowthroatParulidae72024-5%1999
Eastern BluebirdTurdidae72024+175%1999
Rock PigeonColumbidae52024-75%1999
Horned LarkAlaudidae42024+33%1999
Warbling VireoVireonidae42024+150%1999
White-breasted NuthatchSittidae42024+220%2002
Wood ThrushTurdidae42024-58%1999
Cedar WaxwingBombycillidae42024+171%2001
Red-eyed VireoVireonidae32024-11%1999
Yellow WarblerParulidae32024-61%1999
Tufted TitmouseParidae32024-8%1999
Carolina ChickadeeParidae32024-14%1999
Wood DuckAnatidae32024-25%2002

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