BirdAnalyst
BBS Route · Maryland · BCR 30

Berlin Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 122 species recorded across 36 survey years, still active.

122Species 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 →
36Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1980–2024Span
5Observers

Bird Species Found on Maryland Berlin

Top 40 of 122 species by most recent count. Each links to its species trend.

Species recorded on the Berlin 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 CrowCorvidae472024+94%1982
Common GrackleIcteridae352024-70%1982
Carolina WrenTroglodytidae352024+43%1982
Northern CardinalCardinalidae322024-18%1982
European StarlingSturnidae252024-65%1982
Indigo BuntingCardinalidae252024-44%1982
Blue GrosbeakCardinalidae202024+10%1982
Tufted TitmouseParidae182024-28%1982
OvenbirdParulidae162024-76%1982
Blue-gray GnatcatcherPolioptilidae162024+182%1982
Pine WarblerParulidae152024-64%1982
Chipping SparrowPasserellidae122024-6%1982
Red-eyed VireoVireonidae122024-78%1982
Glossy IbisThreskiornithidae112021+150%1982
Great Crested FlycatcherTyrannidae102024+12%1982
Barn SwallowHirundinidae102024-66%1982
Worm-eating WarblerParulidae102024-18%1982
Eastern Wood-PeweeTyrannidae92024-70%1982
White-eyed VireoVireonidae92024-60%1982
Mourning DoveColumbidae82024-19%1982
Pileated WoodpeckerPicidae82024-6%1982
Common YellowthroatParulidae82024-81%1982
Northern MockingbirdMimidae82024-22%1982
Red-bellied WoodpeckerPicidae72024-55%1982
Blue JayCorvidae72024-69%1982
Brown-headed CowbirdIcteridae72024-82%1982
Red-winged BlackbirdIcteridae72024-13%1982
Summer TanagerCardinalidae72024-16%1982
Purple MartinHirundinidae72024+222%1982
Prothonotary WarblerParulidae72024-5%1982
Carolina ChickadeeParidae72024-56%1982
American RobinTurdidae72024-57%1982
Eastern BluebirdTurdidae62024+186%1986
American GoldfinchFringillidae52024+22%1982
KilldeerCharadriidae42024-25%1982
Acadian FlycatcherTyrannidae42024-62%1982
Black-and-white WarblerParulidae42024-42%1982
Gray CatbirdMimidae42022-39%1982
Hairy WoodpeckerPicidae42024+20%1985
Ring-billed GullLaridae42016-46%1988

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