BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Mill Run Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 112 species recorded across 39 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 →
39Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1978–2024Span
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 VireoVireonidae1042024-23%1980
American RobinTurdidae842024+0%1980
American RedstartParulidae352024+210%1980
Chipping SparrowPasserellidae302024-31%1980
Wood ThrushTurdidae262024-18%1980
Eastern TowheePasserellidae242024-22%1980
Hooded WarblerParulidae222024+126%1980
Red-winged BlackbirdIcteridae202024-66%1980
Song SparrowPasserellidae202024+16%1980
Canada GooseAnatidae202009+567%1993
Indigo BuntingCardinalidae192024-55%1980
Brown-headed CowbirdIcteridae182024-6%1980
Scarlet TanagerCardinalidae182024+7%1980
OvenbirdParulidae172024+69%1980
Gray CatbirdMimidae172024+44%1980
Northern CardinalCardinalidae162024+135%1980
Tufted TitmouseParidae152024+156%1980
American CrowCorvidae142024+17%1980
Black-and-white WarblerParulidae142024+86%1980
Rose-breasted GrosbeakCardinalidae122024+240%1987
American GoldfinchFringillidae122024+63%1981
Mourning DoveColumbidae112024+277%1980
European StarlingSturnidae112024+152%1980
Chestnut-sided WarblerParulidae112024+77%1980
Black-capped ChickadeeParidae112024+190%1980
Eastern Wood-PeweeTyrannidae102024+12%1980
Black-throated Green WarblerParulidae102024+311%1980
Cedar WaxwingBombycillidae92024+0%1980
Common YellowthroatParulidae92024+4%1980
Black-throated Blue WarblerParulidae82024+267%1987
White-breasted NuthatchSittidae82024+88%1981
Carolina WrenTroglodytidae82024+250%1991
Acadian FlycatcherTyrannidae72024+57%1980
Barn SwallowHirundinidae72024-46%1980
Eastern MeadowlarkIcteridae62024-78%1980
Common GrackleIcteridae62024-31%1980
Field SparrowPasserellidae62024-66%1980
Blue JayCorvidae52024+700%1981
House SparrowPasseridae52024+7%1980
Eastern BluebirdTurdidae52024+14%1980

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