BirdAnalyst
BBS Route · Delaware · BCR 30

Wilmington Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 106 species recorded across 42 survey years, no longer active.

106Species 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 →
42Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2014Span
6Observers

Bird Species Found on Delaware Wilmington

Top 40 of 106 species by most recent count. Each links to its species trend.

Species recorded on the Wilmington 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 StarlingSturnidae1672014-24%1968
House SparrowPasseridae1112014-48%1968
Red-winged BlackbirdIcteridae352014-74%1968
Northern CardinalCardinalidae352014+194%1968
Common GrackleIcteridae332014-67%1968
American GoldfinchFringillidae232014+40%1968
MallardAnatidae232014+126%1987
Gray CatbirdMimidae212014+172%1968
American RobinTurdidae202014-40%1968
Tree SwallowHirundinidae18201415×1987
Northern MockingbirdMimidae142014-65%1968
Tufted TitmouseParidae122014+100%1968
Blue JayCorvidae112014-11%1968
Cedar WaxwingBombycillidae112014+300%1991
Rock PigeonColumbidae102014+26%1968
Mourning DoveColumbidae102014+69%1968
Song SparrowPasserellidae92014-60%1968
Fish CrowCorvidae82014+933%1969
Carolina ChickadeeParidae82014+87%1970
Canada GooseAnatidae82013+218%1990
Chimney SwiftApodidae72014-43%1968
Carolina WrenTroglodytidae72014+529%1970
Red-eyed VireoVireonidae62014+12%1968
Green HeronArdeidae62012+200%1970
Eastern KingbirdTyrannidae52014-17%1968
American CrowCorvidae52014-62%1968
Western Cattle-EgretArdeidae42013-47%1969
Turkey VultureCathartidae42014+200%1968
Chipping SparrowPasserellidae42014+81%1968
Downy WoodpeckerPicidae42014+29%1970
Scarlet TanagerCardinalidae42006+0%1973
House FinchFringillidae42014-44%1985
Eastern BluebirdTurdidae42014+283%2002
Red-bellied WoodpeckerPicidae32014+200%1969
Field SparrowPasserellidae32014-74%1968
Indigo BuntingCardinalidae32014-44%1968
Barn SwallowHirundinidae32014+13%1968
Glossy IbisThreskiornithidae32009-29%1970
Great Crested FlycatcherTyrannidae32014+200%1969
Great Blue HeronArdeidae32014+233%1988

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