BirdAnalyst
BBS Route · Maryland · BCR 29

Silver Spg Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 93 species recorded across 24 survey years, no longer active.

93Species 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 →
24Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–1989Span
2Observers

Bird Species Found on Maryland Silver Spg

Top 40 of 93 species by most recent count. Each links to its species trend.

Species recorded on the Silver Spg 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
House SparrowPasseridae811989+114%1968
European StarlingSturnidae631989-55%1968
American RobinTurdidae611989-7%1968
House FinchFringillidae53198919×1979
Mourning DoveColumbidae441989+88%1968
American CrowCorvidae401989+25%1968
Northern CardinalCardinalidae401989+53%1968
Song SparrowPasserellidae351989+365%1968
Northern MockingbirdMimidae331989-9%1968
Tufted TitmouseParidae271989+60%1968
Chimney SwiftApodidae251989+85%1968
Gray CatbirdMimidae231989+147%1968
Carolina ChickadeeParidae211989+196%1968
Common GrackleIcteridae201989-60%1968
Northern House WrenTroglodytidae131989+155%1968
Chipping SparrowPasserellidae121989-26%1968
Purple MartinHirundinidae111989+57%1968
Downy WoodpeckerPicidae101989+229%1968
Red-bellied WoodpeckerPicidae91989+150%1968
American GoldfinchFringillidae91989+67%1968
Barn SwallowHirundinidae91989-34%1968
Carolina WrenTroglodytidae81989+350%1968
Canada GooseAnatidae81983n/an/a
Indigo BuntingCardinalidae71989-36%1968
Rock PigeonColumbidae61989+46%1968
Blue JayCorvidae61989-66%1968
Brown-headed CowbirdIcteridae61989+740%1968
Red-winged BlackbirdIcteridae61989-4%1968
Red-eyed VireoVireonidae61989+65%1968
Wood ThrushTurdidae61989+33%1968
Fish CrowCorvidae61989+220%1979
Eastern KingbirdTyrannidae51989+42%1968
Eastern Wood-PeweeTyrannidae51989+33%1968
Eastern TowheePasserellidae51989+67%1968
Acadian FlycatcherTyrannidae41989-17%1968
Orchard OrioleIcteridae41989+333%1973
Baltimore OrioleIcteridae41989+233%1972
Common YellowthroatParulidae41989+0%1968
Yellow-billed CuckooCuculidae31989+175%1969
Field SparrowPasserellidae31989+138%1968

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