BirdAnalyst
BBS Route · Pennsylvania · BCR 28

Mars Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 110 species recorded across 23 survey years, still active.

110Species 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 →
23Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1989–2025Span
6Observers

Bird Species Found on Pennsylvania Mars

Top 40 of 110 species by most recent count. Each links to its species trend.

Species recorded on the Mars 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
American RobinTurdidae582025-51%1991
European StarlingSturnidae522025-71%1991
Red-winged BlackbirdIcteridae512025-83%1991
Mourning DoveColumbidae322025-58%1991
Song SparrowPasserellidae302025-51%1991
Northern CardinalCardinalidae272025-24%1991
American GoldfinchFringillidae222025-30%1991
Wood ThrushTurdidae212025-66%1991
House SparrowPasseridae182025-86%1991
Chipping SparrowPasserellidae172025-63%1991
Barn SwallowHirundinidae172025-49%1991
American CrowCorvidae152025-39%1991
Common GrackleIcteridae142025-75%1991
Tufted TitmouseParidae132025+54%1991
Indigo BuntingCardinalidae122025-49%1991
Gray CatbirdMimidae122025-68%1991
Rock PigeonColumbidae122025-48%1992
Blue JayCorvidae112025-6%1991
Northern MockingbirdMimidae112025+633%2006
Red-eyed VireoVireonidae102025-56%1991
Carolina WrenTroglodytidae102025+114%1991
Common YellowthroatParulidae92025-84%1991
Red-bellied WoodpeckerPicidae82025+71%1991
Eastern TowheePasserellidae82025-56%1991
Brown-headed CowbirdIcteridae72025-14%1991
House FinchFringillidae72025-42%1991
Chimney SwiftApodidae62024-60%1991
Eastern Wood-PeweeTyrannidae62025-47%1991
Pileated WoodpeckerPicidae62025+60%1994
Northern House WrenTroglodytidae52025-56%1991
Prairie WarblerParulidae51995+14%1992
KilldeerCharadriidae42025-32%1991
Eastern MeadowlarkIcteridae42025-70%1991
Scarlet TanagerCardinalidae42025-31%1993
Baltimore OrioleIcteridae42025-56%1992
Bank SwallowHirundinidae41995-8%1993
Downy WoodpeckerPicidae32025-50%1991
Eastern PhoebeTyrannidae32025-67%1991
Acadian FlycatcherTyrannidae32025-65%1991
Field SparrowPasserellidae32025-85%1991

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