BirdAnalyst
BBS Route · Pennsylvania · BCR 29

Chatham Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 92 species recorded across 24 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 →
24Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1997–2025Span
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 StarlingSturnidae1262025-5%1999
Gray CatbirdMimidae562025+177%1999
American RobinTurdidae562025-23%1999
Song SparrowPasserellidae402025+91%1999
Barn SwallowHirundinidae392025+108%1999
Chipping SparrowPasserellidae382025+98%1999
Northern CardinalCardinalidae362025+67%1999
Mourning DoveColumbidae282025+16%1999
Common GrackleIcteridae272025-55%1999
Carolina WrenTroglodytidae272025+743%1999
Red-bellied WoodpeckerPicidae182025+143%1999
Wood ThrushTurdidae182025-4%1999
Northern House WrenTroglodytidae172025+9%1999
Red-winged BlackbirdIcteridae162025-68%1999
Brown-headed CowbirdIcteridae152025+231%1999
American GoldfinchFringillidae152025+15%1999
Eastern Wood-PeweeTyrannidae142025+67%1999
House SparrowPasseridae142025-56%1999
House FinchFringillidae122025+45%1999
Indigo BuntingCardinalidae122025+3%1999
Chimney SwiftApodidae112025-16%1999
Common YellowthroatParulidae112025+0%1999
Downy WoodpeckerPicidae102025+700%2000
Eastern BluebirdTurdidae102025+200%1999
Blue JayCorvidae92025+3%1999
American CrowCorvidae72025-73%1999
Northern MockingbirdMimidae72025-42%1999
Fish CrowCorvidae72025+50%2019
Rock PigeonColumbidae52024-75%1999
Eastern KingbirdTyrannidae52025+73%1999
Red-eyed VireoVireonidae52025-17%1999
Warbling VireoVireonidae52025+150%1999
Great Blue HeronArdeidae52025+100%2000
Cedar WaxwingBombycillidae52025+7%2001
Red-tailed HawkAccipitridae42025-15%1999
White-breasted NuthatchSittidae42025+180%2002
Carolina ChickadeeParidae42025-29%1999
Belted KingfisherAlcedinidae42025+100%2006
Eastern TowheePasserellidae42025+100%2002
Horned LarkAlaudidae32025+44%1999

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