BirdAnalyst
BBS Route · Maryland · BCR 29

Upper Xrds Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 100 species recorded across 43 survey years, no longer active.

100Species 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 →
43Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2008Span
1Observers

Bird Species Found on Maryland Upper Xrds

Top 40 of 100 species by most recent count. Each links to its species trend.

Species recorded on the Upper Xrds 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 RobinTurdidae732008-32%1968
House SparrowPasseridae602008-33%1968
European StarlingSturnidae592008-69%1968
Mourning DoveColumbidae482008-2%1968
American CrowCorvidae402008+22%1968
Northern MockingbirdMimidae402008-33%1968
Canada GooseAnatidae352008+237%1994
Northern CardinalCardinalidae322008+94%1968
Common GrackleIcteridae312008-73%1968
Gray CatbirdMimidae252008+125%1968
Song SparrowPasserellidae212008-34%1968
Blue JayCorvidae162008-39%1968
Red-winged BlackbirdIcteridae162008-73%1968
Tufted TitmouseParidae162008+114%1968
Chipping SparrowPasserellidae142008-24%1968
Double-crested CormorantPhalacrocoracidae132005+275%2001
Turkey VultureCathartidae122008+263%1995
Barn SwallowHirundinidae112008-26%1968
Carolina WrenTroglodytidae112008+246%1969
House FinchFringillidae112008+114%1981
Red-bellied WoodpeckerPicidae102008-3%1968
Chimney SwiftApodidae92008-52%1968
Great Horned OwlStrigidae71994+80%1986
Red-eyed VireoVireonidae52008-52%1968
OvenbirdParulidae52006+167%1969
Orchard OrioleIcteridae42007+38%1968
Northern House WrenTroglodytidae42008-51%1968
Bank SwallowHirundinidae41970n/an/a
Black-billed CuckooCuculidae42004+150%1987
Great Blue HeronArdeidae42007+125%1992
Great Crested FlycatcherTyrannidae32006-33%1968
American GoldfinchFringillidae32008-50%1968
Indigo BuntingCardinalidae32008-86%1968
Scarlet TanagerCardinalidae32006-29%1970
Common YellowthroatParulidae32008-42%1968
Yellow-breasted ChatIcteriidae31999-14%1968
Brown ThrasherMimidae32007-46%1968
KilldeerCharadriidae32008+75%1969
Blue GrosbeakCardinalidae32007+67%1971
MallardAnatidae32008+450%1971

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