BirdAnalyst
BBS Route · Pennsylvania · BCR 28

South Mtn Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 85 species recorded across 37 survey years, still active.

85Species 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 →
37Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1986–2025Span
2Observers

Bird Species Found on Pennsylvania South Mtn

Top 40 of 85 species by most recent count. Each links to its species trend.

Species recorded on the South Mtn 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
Red-eyed VireoVireonidae452025+32%1988
Eastern Wood-PeweeTyrannidae272025-30%1988
Eastern TowheePasserellidae222025-46%1988
OvenbirdParulidae172025-5%1988
American RobinTurdidae172025-40%1988
Chipping SparrowPasserellidae132025+39%1988
Gray CatbirdMimidae132025+4%1988
Wood ThrushTurdidae132025-52%1988
Mourning DoveColumbidae112025-36%1988
American CrowCorvidae102025+56%1988
American GoldfinchFringillidae92025+0%1988
Northern CardinalCardinalidae92025+71%1988
European StarlingSturnidae82023-30%1988
House FinchFringillidae82025-42%1988
Scarlet TanagerCardinalidae72025-72%1988
Northern House WrenTroglodytidae72025-19%1988
Tufted TitmouseParidae62025-57%1988
Acadian FlycatcherTyrannidae52025+50%1988
Common YellowthroatParulidae52025-27%1988
VeeryTurdidae52023+40%1989
Hooded WarblerParulidae42025-55%1988
Carolina WrenTroglodytidae42023+300%1988
White-breasted NuthatchSittidae42025+114%1989
Downy WoodpeckerPicidae32025+33%1988
Wild TurkeyPhasianidae32007+100%1994
Black-throated Green WarblerParulidae32025+33%2018
Canada GooseAnatidae22013-57%1991
Red-bellied WoodpeckerPicidae22025-42%1988
Ruby-throated HummingbirdTrochilidae22023+25%1988
Great Crested FlycatcherTyrannidae22025-86%1988
Eastern PhoebeTyrannidae22019-43%1989
Blue JayCorvidae22025-51%1988
Indigo BuntingCardinalidae22025+6%1988
Barn SwallowHirundinidae22025-22%1988
Black-and-white WarblerParulidae22025-59%1988
Worm-eating WarblerParulidae22025-14%1989
Northern MockingbirdMimidae22025+33%1990
Hairy WoodpeckerPicidae22022+25%1992
Eastern Whip-poor-willCaprimulgidae22017-43%1991
KilldeerCharadriidae21996+100%1995

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