BirdAnalyst
BBS Route · Maryland · BCR 30

Walnut Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 100 species recorded across 17 survey years, still 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 →
17Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1999–2024Span
5Observers

Bird Species Found on Maryland Walnut

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

Species recorded on the Walnut 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 StarlingSturnidae2372024+41%2001
American CrowCorvidae582024-34%2001
American RobinTurdidae492024-27%2001
Carolina WrenTroglodytidae482024+210%2001
Common GrackleIcteridae442024-91%2001
Northern CardinalCardinalidae402024+21%2001
Eastern BluebirdTurdidae322024+750%2004
Chipping SparrowPasserellidae282024+13%2001
Mourning DoveColumbidae272024-39%2001
Northern MockingbirdMimidae262024-29%2001
Turkey VultureCathartidae25202411×2001
Blue GrosbeakCardinalidae232024+93%2001
Barn SwallowHirundinidae232024+35%2001
Tufted TitmouseParidae232024-14%2001
Red-eyed VireoVireonidae202024+264%2001
Red-winged BlackbirdIcteridae192024-25%2001
Indigo BuntingCardinalidae182024-4%2001
American GoldfinchFringillidae172024+67%2001
House SparrowPasseridae172024-86%2001
Laughing GullLaridae152024+55%2001
Eastern MeadowlarkIcteridae152024+100%2004
Carolina ChickadeeParidae152024+12%2001
House FinchFringillidae142024+8%2001
Chimney SwiftApodidae132024+7%2001
Fish CrowCorvidae132024+79%2001
Purple MartinHirundinidae132024+60%2001
Northern House WrenTroglodytidae132024+129%2001
Great Crested FlycatcherTyrannidae122024-17%2001
White-eyed VireoVireonidae122024-14%2005
Orchard OrioleIcteridae112024-10%2001
Pine WarblerParulidae112024+77%2001
Red-bellied WoodpeckerPicidae82024-7%2001
Blue JayCorvidae82024-10%2001
Yellow-billed CuckooCuculidae72024+217%2004
Black VultureCathartidae72024+167%2016
Ring-billed GullLaridae62005+20%1999
Downy WoodpeckerPicidae62024+18%2001
Eastern Wood-PeweeTyrannidae62024+75%2001
Field SparrowPasserellidae62024+50%2001
Eastern KingbirdTyrannidae62024+27%2004

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