BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Mill Run Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 112 species recorded across 40 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 →
40Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1978–2025Span
3Observers

Bird Species Found on Pennsylvania Mill Run

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

Species recorded on the Mill Run 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 VireoVireonidae1022025-23%1980
American RobinTurdidae882025+4%1980
American RedstartParulidae442025+260%1980
Chipping SparrowPasserellidae342025-29%1980
Eastern Wood-PeweeTyrannidae292025+39%1980
Eastern TowheePasserellidae292025-10%1980
American CrowCorvidae242025+17%1980
Gray CatbirdMimidae232025+61%1980
Wood ThrushTurdidae232025-19%1980
Red-winged BlackbirdIcteridae212025-63%1980
Canada GooseAnatidae202009+567%1993
OvenbirdParulidae192025+61%1980
Scarlet TanagerCardinalidae182025+9%1980
Song SparrowPasserellidae172025+0%1980
Indigo BuntingCardinalidae172025-59%1980
Northern CardinalCardinalidae152025+96%1980
Chestnut-sided WarblerParulidae152025+46%1980
Rose-breasted GrosbeakCardinalidae142025+240%1987
Black-and-white WarblerParulidae142025+81%1980
Cedar WaxwingBombycillidae132025-3%1980
Hooded WarblerParulidae132025+130%1980
Acadian FlycatcherTyrannidae122025+214%1980
Common GrackleIcteridae122025-29%1980
Tufted TitmouseParidae122025+131%1980
American GoldfinchFringillidae122025+100%1981
European StarlingSturnidae112025+116%1980
Barn SwallowHirundinidae112025-37%1980
Black-throated Green WarblerParulidae112025+322%1980
Chimney SwiftApodidae102025+0%1980
Brown-headed CowbirdIcteridae102025+6%1980
Blue JayCorvidae82025+600%1981
Yellow WarblerParulidae82025-30%1980
Cliff SwallowHirundinidae72025+320%1992
Mourning DoveColumbidae62025+177%1980
Downy WoodpeckerPicidae62025+0%1980
Common YellowthroatParulidae62025-7%1980
Eastern PhoebeTyrannidae62025+300%1988
House SparrowPasseridae52025-37%1980
Black-capped ChickadeeParidae52025+140%1980
Blue-headed VireoVireonidae52024-60%1989

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