BirdAnalyst
BBS Route · Delaware · BCR 30

Blackbird Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 129 species recorded across 29 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 →
29Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1994–2024Span
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
Red-winged BlackbirdIcteridae1002024-75%1996
Purple MartinHirundinidae912024+134%1996
Common YellowthroatParulidae522024-19%1996
Barn SwallowHirundinidae442024+0%1996
Common GrackleIcteridae402024-84%1996
European StarlingSturnidae382024+6%1996
Indigo BuntingCardinalidae382024-34%1996
Northern CardinalCardinalidae332024+57%1996
American RobinTurdidae322024-55%1996
Gray CatbirdMimidae312024+20%1996
Mourning DoveColumbidae302024+31%1996
House SparrowPasseridae282024-44%1996
Chipping SparrowPasserellidae272024+850%1996
Carolina WrenTroglodytidae252024+382%1996
Ring-billed GullLaridae252017+35%2008
Great EgretArdeidae242024-60%1996
Great Blue HeronArdeidae232024+206%1996
Northern MockingbirdMimidae232024-27%1996
Brown-headed CowbirdIcteridae202024-13%1996
Blue GrosbeakCardinalidae202024+16%1996
Eastern Wood-PeweeTyrannidae182024+54%1996
Blue JayCorvidae182024+3%1996
Field SparrowPasserellidae172024+94%1996
Marsh WrenTroglodytidae152024-24%1996
Wood ThrushTurdidae152024-55%1996
Black SkimmerLaridae142023+131%2003
Rock PigeonColumbidae132024+21%1996
Red-eyed VireoVireonidae122024+19%1996
Laughing GullLaridae112023+86%1997
Northern BobwhiteOdontophoridae112024-61%1996
Yellow-billed CuckooCuculidae112024+111%1996
Song SparrowPasserellidae112024-29%1996
American CrowCorvidae102024-61%1996
Canada GooseAnatidae102024-33%1999
Herring GullLaridae92009-63%1998
Boat-tailed GrackleIcteridae82015+120%1996
American GoldfinchFringillidae82024-71%1996
Yellow-breasted ChatIcteriidae82024+200%1996
Horned LarkAlaudidae72024+140%1996
Brown ThrasherMimidae72024-36%1996

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