BirdAnalyst
BBS Route · Pennsylvania · BCR 29

Mt Gretna 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 94 species recorded across 20 survey years, still active.

94Species 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 →
20Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2001–2022Span
4Observers

Bird Species Found on Pennsylvania Mt Gretna 2

Top 40 of 94 species by most recent count. Each links to its species trend.

Species recorded on the Mt Gretna 2 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 StarlingSturnidae2212022-54%2003
Common GrackleIcteridae872022-65%2003
American RobinTurdidae762022+5%2003
Mourning DoveColumbidae472022-35%2003
Northern CardinalCardinalidae392022+80%2003
Black VultureCathartidae372017+550%2007
Gray CatbirdMimidae362022+119%2003
Barn SwallowHirundinidae332022+33%2003
Rock PigeonColumbidae312022+24%2003
House FinchFringillidae302022+14%2003
Song SparrowPasserellidae262022+250%2003
American CrowCorvidae232022-53%2003
Indigo BuntingCardinalidae212022+743%2003
Northern House WrenTroglodytidae192022+318%2003
American GoldfinchFringillidae152022+152%2003
Chipping SparrowPasserellidae152022+205%2003
Blue JayCorvidae142022+136%2003
Carolina WrenTroglodytidae132022+457%2003
Brown-headed CowbirdIcteridae122022+139%2004
Red-bellied WoodpeckerPicidae112022+167%2003
Red-winged BlackbirdIcteridae112022+15%2003
House SparrowPasseridae102022-55%2003
Chimney SwiftApodidae92022+23%2003
Northern MockingbirdMimidae92019-27%2003
Carolina ChickadeeParidae92022+144%2005
Wood ThrushTurdidae82022+21%2003
OvenbirdParulidae72022+110%2003
Cedar WaxwingBombycillidae72022+683%2009
Blue-gray GnatcatcherPolioptilidae72017+9%2015
Downy WoodpeckerPicidae62022+0%2003
Red-eyed VireoVireonidae62022-36%2003
Eastern BluebirdTurdidae62022+333%2003
Brown ThrasherMimidae62022+100%2011
KilldeerCharadriidae52022+57%2004
Great Blue HeronArdeidae42018+13%2003
Red-tailed HawkAccipitridae42022+33%2003
Eastern PhoebeTyrannidae42022+333%2010
Eastern Wood-PeweeTyrannidae42022+140%2005
Tufted TitmouseParidae42022-29%2003
Orchard OrioleIcteridae42017+67%2015

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