BirdAnalyst
BBS Route · Delaware · BCR 30

Harrington Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 141 species recorded across 56 survey years, still active.

141Species 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 →
56Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2025Span
5Observers

Bird Species Found on Delaware Harrington

Top 40 of 141 species by most recent count. Each links to its species trend.

Species recorded on the Harrington 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
Common GrackleIcteridae1132025+4%1968
Purple MartinHirundinidae113202541×1970
Mourning DoveColumbidae922025+287%1968
Red-winged BlackbirdIcteridae842025-2%1968
European StarlingSturnidae812025+4%1968
American RobinTurdidae762025+320%1968
Barn SwallowHirundinidae672025+144%1969
House SparrowPasseridae562025-61%1968
Northern CardinalCardinalidae512025+226%1968
Turkey VultureCathartidae492025+348%1968
Laughing GullLaridae462025-65%1968
House FinchFringillidae42202519×1985
Northern MockingbirdMimidae412025+20%1968
Canada GooseAnatidae352025+777%1994
Carolina WrenTroglodytidae34202511×1968
American CrowCorvidae292025+19%1968
Chipping SparrowPasserellidae292025-13%1968
Red-bellied WoodpeckerPicidae272025+331%1968
Great Crested FlycatcherTyrannidae252025+340%1968
Fish CrowCorvidae25202512×1968
Blue GrosbeakCardinalidae22202513×1971
Song SparrowPasserellidae212025+63%1968
Tufted TitmouseParidae212025+157%1968
WilletScolopacidae202025-30%1968
Seaside SparrowPasserellidae19202516×1973
Brown-headed CowbirdIcteridae182025+323%1968
Indigo BuntingCardinalidae172025+190%1968
Red-eyed VireoVireonidae172025+46%1968
Eastern Wood-PeweeTyrannidae152025+157%1968
Blue JayCorvidae152025+72%1968
Common YellowthroatParulidae152025+61%1968
OspreyPandionidae122025+620%1968
American GoldfinchFringillidae122025+400%1968
Carolina ChickadeeParidae122025+255%1968
Chimney SwiftApodidae112025+165%1968
Great Blue HeronArdeidae11202518×1972
Acadian FlycatcherTyrannidae92025+533%1970
Horned LarkAlaudidae92025+52%1968
Double-crested CormorantPhalacrocoracidae82025+10%1994
Tree SwallowHirundinidae82025+350%1971

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