BirdAnalyst
BBS Route · Maryland · BCR 29

Theodore Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 114 species recorded across 49 survey years, still active.

114Species 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 →
49Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2016Span
2Observers

Bird Species Found on Maryland Theodore

Top 40 of 114 species by most recent count. Each links to its species trend.

Species recorded on the Theodore 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 CrowCorvidae422016+15%1970
American RobinTurdidae412016-54%1970
Northern CardinalCardinalidae372016+42%1970
Ring-billed GullLaridae341970n/an/a
Northern MockingbirdMimidae212016+14%1970
Tufted TitmouseParidae202016+61%1970
Gray CatbirdMimidae192016+159%1970
Mourning DoveColumbidae172016+57%1970
Indigo BuntingCardinalidae172016+4%1970
Carolina WrenTroglodytidae172016+660%1970
Red-eyed VireoVireonidae162016-15%1970
House FinchFringillidae152016+175%1984
Song SparrowPasserellidae142016-20%1970
Black VultureCathartidae142016+600%1988
House SparrowPasseridae132016-92%1970
Canada GooseAnatidae132016+300%1995
European StarlingSturnidae122016-88%1970
Wood ThrushTurdidae122016-42%1970
Red-winged BlackbirdIcteridae112016-82%1970
American Black DuckAnatidae111974n/an/a
Turkey VultureCathartidae82016-20%1970
American GoldfinchFringillidae82016-59%1971
Red-bellied WoodpeckerPicidae82016+77%1972
Blue JayCorvidae72016-65%1970
Chipping SparrowPasserellidae72016-37%1970
Common GrackleIcteridae62016-95%1970
Northern House WrenTroglodytidae62016-23%1970
Eastern BluebirdTurdidae62016+200%1979
Savannah SparrowPasserellidae51968n/an/a
Eastern TowheePasserellidae52016-83%1970
White-breasted NuthatchSittidae52016+150%1992
Scarlet TanagerCardinalidae42016+38%1971
Carolina ChickadeeParidae42016-58%1970
Purple MartinHirundinidae42016-38%1972
Bank SwallowHirundinidae42013+71%1980
Rock PigeonColumbidae32012-94%1970
Eastern KingbirdTyrannidae32016-72%1970
Eastern Wood-PeweeTyrannidae32016-21%1970
Brown-headed CowbirdIcteridae32016-81%1970
Barn SwallowHirundinidae32016-85%1970

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