BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Marsh Hill Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 122 species recorded across 41 survey years, still active.

122Species 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 →
41Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1983–2024Span
2Observers

Bird Species Found on Pennsylvania Marsh Hill

Top 40 of 122 species by most recent count. Each links to its species trend.

Species recorded on the Marsh Hill 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 VireoVireonidae822024+143%1985
American RobinTurdidae572024-5%1985
OvenbirdParulidae452024+71%1986
American CrowCorvidae302024-23%1985
Gray CatbirdMimidae282024+236%1985
Eastern TowheePasserellidae232024+136%1986
VeeryTurdidae212024+120%1986
Song SparrowPasserellidae202024+48%1985
Common YellowthroatParulidae172024-12%1986
Cedar WaxwingBombycillidae162024-46%1985
Wood ThrushTurdidae162024-35%1985
Mourning DoveColumbidae152024+52%1985
Northern CardinalCardinalidae152024+250%1986
Tufted TitmouseParidae152024+313%1986
Black-capped ChickadeeParidae152024-22%1986
Black-throated Green WarblerParulidae142024-54%1986
American RedstartParulidae142024+25%1985
Yellow-bellied SapsuckerPicidae132024+514%1986
Northern House WrenTroglodytidae132024+42%1985
Eastern PhoebeTyrannidae122024+86%1985
Red-winged BlackbirdIcteridae122024-39%1985
Hermit ThrushTurdidae112024-29%1986
Chestnut-sided WarblerParulidae112024+620%1990
Tree SwallowHirundinidae102024+17%1985
Blue-headed VireoVireonidae102024+109%1986
American GoldfinchFringillidae92024+26%1985
Chipping SparrowPasserellidae92024-58%1985
Barn SwallowHirundinidae82024-81%1985
Yellow WarblerParulidae82024-5%1986
Eastern Wood-PeweeTyrannidae72024+46%1986
Common GrackleIcteridae72024-30%1985
Scarlet TanagerCardinalidae72024-46%1986
Black-and-white WarblerParulidae72024+10%1986
Blackburnian WarblerParulidae72024-23%1986
Carolina WrenTroglodytidae72024+267%1992
Rose-breasted GrosbeakCardinalidae52024-77%1986
Canada WarblerParulidae52024+233%1987
Magnolia WarblerParulidae52024+40%1987
Great Crested FlycatcherTyrannidae42023-57%1986
Blue JayCorvidae42024-11%1985

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