BirdAnalyst
BBS Route · Maryland · BCR 29

Warfieldsbrg Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 99 species recorded across 56 survey years, still active.

99Species 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 →
56Years 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
3Observers

Bird Species Found on Maryland Warfieldsbrg

Top 40 of 99 species by most recent count. Each links to its species trend.

Species recorded on the Warfieldsbrg 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 StarlingSturnidae842025-62%1968
Northern CardinalCardinalidae622025+255%1968
American CrowCorvidae582025+42%1968
American RobinTurdidae502025+17%1968
Chipping SparrowPasserellidae462025+191%1968
Gray CatbirdMimidae402025+115%1968
Carolina WrenTroglodytidae40202517×1969
Song SparrowPasserellidae362025+90%1968
House SparrowPasseridae312025-68%1968
Northern MockingbirdMimidae312025+20%1968
House FinchFringillidae312025+556%1983
Tufted TitmouseParidae212025+83%1968
Common GrackleIcteridae202025-91%1968
Mourning DoveColumbidae182025-57%1968
Blue JayCorvidae182025+23%1968
Barn SwallowHirundinidae172025+3%1968
Canada GooseAnatidae172024+48%1984
Red-winged BlackbirdIcteridae162025-90%1968
Eastern Wood-PeweeTyrannidae152025+115%1968
Indigo BuntingCardinalidae152025-37%1968
Cedar WaxwingBombycillidae142025-45%1995
Red-bellied WoodpeckerPicidae122025+19%1968
Common YellowthroatParulidae102025+18%1968
Northern House WrenTroglodytidae102025-8%1968
Eastern BluebirdTurdidae102025+750%1969
Carolina ChickadeeParidae92025+200%1969
Fish CrowCorvidae82025+50%1968
Grasshopper SparrowPasserellidae62025-78%1968
Chimney SwiftApodidae52025-54%1968
Eastern KingbirdTyrannidae52025+350%1968
Great Crested FlycatcherTyrannidae52025-39%1968
American GoldfinchFringillidae52025+15%1968
Red-eyed VireoVireonidae52025+44%1968
Downy WoodpeckerPicidae52025+143%1970
White-breasted NuthatchSittidae52025+333%1971
Acadian FlycatcherTyrannidae42025+18%1968
Orchard OrioleIcteridae42018+0%1969
Wood ThrushTurdidae42025-51%1968
Eastern PhoebeTyrannidae32024+38%1968
Eastern MeadowlarkIcteridae32024-93%1968

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