BirdAnalyst
BBS Route · Pennsylvania · BCR 29

Mt Gretna Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 86 species recorded across 16 survey years, no longer active.

86Species 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 →
16Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2000Span
5Observers

Bird Species Found on Pennsylvania Mt Gretna

Top 40 of 86 species by most recent count. Each links to its species trend.

Species recorded on the Mt Gretna 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
European StarlingSturnidae3152000+119%1968
Common GrackleIcteridae1582000-23%1968
House SparrowPasseridae1232000-7%1968
American RobinTurdidae702000+19%1968
American CrowCorvidae412000-44%1968
Mourning DoveColumbidae362000+326%1968
House FinchFringillidae322000+156%1990
Canada GooseAnatidae29200015×1992
Barn SwallowHirundinidae242000-10%1968
Red-winged BlackbirdIcteridae232000-47%1968
Tufted TitmouseParidae182000+233%1968
Gray CatbirdMimidae172000-7%1968
Song SparrowPasserellidae162000+92%1968
Rock PigeonColumbidae152000-27%1969
Northern CardinalCardinalidae122000+115%1968
Purple MartinHirundinidae111970+20%1967
Northern MockingbirdMimidae112000-36%1968
Brown-headed CowbirdIcteridae102000+47%1968
Cedar WaxwingBombycillidae92000+350%1968
Chipping SparrowPasserellidae82000-6%1968
Wood ThrushTurdidae82000+36%1968
American GoldfinchFringillidae72000+23%1968
KilldeerCharadriidae62000-19%1968
Chimney SwiftApodidae62000-32%1968
Blue JayCorvidae62000-3%1968
Northern House WrenTroglodytidae62000-25%1968
Tree SwallowHirundinidae62000+150%1994
Turkey VultureCathartidae52000-6%1992
OvenbirdParulidae52000+150%1988
Carolina ChickadeeParidae52000+80%1990
Belted KingfisherAlcedinidae41999+33%1968
Downy WoodpeckerPicidae42000-22%1969
Eastern KingbirdTyrannidae42000+0%1969
Field SparrowPasserellidae42000-11%1968
Baltimore OrioleIcteridae42000-13%1970
Yellow WarblerParulidae42000+40%1988
Common YellowthroatParulidae42000+140%1969
Northern BobwhiteOdontophoridae31970-38%1967
Red-bellied WoodpeckerPicidae32000+100%1969
Great Crested FlycatcherTyrannidae32000-44%1969

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