BirdAnalyst
BBS Route · Delaware · BCR 30

Blackbird Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 129 species recorded across 30 survey years, still active.

129Species 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 →
30Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1994–2025Span
4Observers

Bird Species Found on Delaware Blackbird

Top 40 of 129 species by most recent count. Each links to its species trend.

Species recorded on the Blackbird 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
Purple MartinHirundinidae1062025+143%1996
European StarlingSturnidae852025-10%1996
Red-winged BlackbirdIcteridae772025-78%1996
Common GrackleIcteridae632025-83%1996
House SparrowPasseridae512025-49%1996
Common YellowthroatParulidae422025-13%1996
MallardAnatidae352025-62%1997
Northern CardinalCardinalidae342025+64%1996
Indigo BuntingCardinalidae342025-38%1996
American RobinTurdidae312025-54%1996
Barn SwallowHirundinidae292025-18%1996
Blue GrosbeakCardinalidae272025+14%1996
Gray CatbirdMimidae252025+20%1996
Ring-billed GullLaridae252017+35%2008
Mourning DoveColumbidae242025+18%1996
Chipping SparrowPasserellidae202025+838%1996
Tree SwallowHirundinidae182025-41%1996
Carolina WrenTroglodytidae182025+294%1996
Northern MockingbirdMimidae172025-29%1996
Red-eyed VireoVireonidae162025+17%1996
Marsh WrenTroglodytidae142025-32%1996
Wood ThrushTurdidae142025-60%1996
Black SkimmerLaridae142023+131%2003
KilldeerCharadriidae132025-38%1996
Eastern Wood-PeweeTyrannidae132025+71%1996
Orchard OrioleIcteridae132025+150%1996
Song SparrowPasserellidae122025-40%1996
Great EgretArdeidae112025-66%1996
Horned LarkAlaudidae102025+80%1996
Brown ThrasherMimidae102025-9%1996
Canada GooseAnatidae102024-33%1999
Herring GullLaridae92009-63%1998
Red-bellied WoodpeckerPicidae92025-15%1996
American GoldfinchFringillidae92025-70%1996
Field SparrowPasserellidae92025+89%1996
Snowy EgretArdeidae82025-42%1996
Brown-headed CowbirdIcteridae82025-36%1996
Boat-tailed GrackleIcteridae82015+120%1996
Yellow-breasted ChatIcteriidae82025+214%1996
Glossy IbisThreskiornithidae72025-79%1996

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