BirdAnalyst
BBS Route · Maryland · BCR 29

Olney Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 112 species recorded across 58 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 →
58Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2025Span
10Observers

Bird Species Found on Maryland Olney

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

Species recorded on the Olney 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
Northern CardinalCardinalidae1322025+444%1968
Gray CatbirdMimidae1162025+757%1968
European StarlingSturnidae1082025+106%1968
Chipping SparrowPasserellidae962025+343%1968
Red-winged BlackbirdIcteridae782025-55%1968
Mourning DoveColumbidae772025+64%1968
American CrowCorvidae732025+9%1968
Tufted TitmouseParidae722025+953%1968
Carolina WrenTroglodytidae59202519×1970
American RobinTurdidae522025+47%1968
Barn SwallowHirundinidae512025+321%1968
Song SparrowPasserellidae492025+139%1968
Northern MockingbirdMimidae492025+122%1968
Carolina ChickadeeParidae492025+733%1970
Red-eyed VireoVireonidae452025+419%1968
House SparrowPasseridae392025-65%1968
Cedar WaxwingBombycillidae38202520×1972
Eastern BluebirdTurdidae37202520×1972
American GoldfinchFringillidae362025+142%1968
Brown-headed CowbirdIcteridae352025+233%1968
Red-bellied WoodpeckerPicidae332025+416%1968
Indigo BuntingCardinalidae332025+13%1968
Eastern Wood-PeweeTyrannidae322025+252%1968
Blue JayCorvidae312025+239%1968
Common GrackleIcteridae282025-84%1968
House FinchFringillidae282025+300%1984
Eastern KingbirdTyrannidae252025+176%1968
Blue-gray GnatcatcherPolioptilidae212025+446%1968
Brown ThrasherMimidae202025+56%1968
Fish CrowCorvidae172025+814%1968
Rock PigeonColumbidae152025+6%1968
Common YellowthroatParulidae152025+40%1968
Wood ThrushTurdidae152025-14%1968
Chimney SwiftApodidae142025+47%1968
Great Crested FlycatcherTyrannidae142025+182%1968
Canada GooseAnatidae142025+157%1988
Eastern TowheePasserellidae132025+58%1968
Northern House WrenTroglodytidae132025+120%1968
Orchard OrioleIcteridae132025+210%1977
Scarlet TanagerCardinalidae122024+32%1970

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