BirdAnalyst
BBS Route · Delaware · BCR 30

Frederica Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 106 species recorded across 49 survey years, still 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 →
49Years 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
6Observers

Bird Species Found on Delaware Frederica

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

Species recorded on the Frederica 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 StarlingSturnidae2112025+112%1968
Northern CardinalCardinalidae1032025+162%1968
Common GrackleIcteridae972025-56%1968
American RobinTurdidae892025+241%1968
Mourning DoveColumbidae542025-10%1968
Carolina WrenTroglodytidae372025+546%1968
Chipping SparrowPasserellidae352025-3%1968
House SparrowPasseridae352025-59%1968
Indigo BuntingCardinalidae342025+76%1968
Brown-headed CowbirdIcteridae332025+479%1968
Carolina ChickadeeParidae322025+390%1969
American GoldfinchFringillidae302025+80%1968
Tufted TitmouseParidae292025+15%1968
Red-winged BlackbirdIcteridae242025-50%1968
Blue JayCorvidae232025+97%1968
Red-bellied WoodpeckerPicidae222025+31%1968
Northern MockingbirdMimidae212025-30%1968
Barn SwallowHirundinidae202025+85%1968
American CrowCorvidae192025-10%1968
Eastern Wood-PeweeTyrannidae182025+154%1968
Canada GooseAnatidae172025+400%1984
Song SparrowPasserellidae162025+117%1968
Wood ThrushTurdidae132025-14%1968
Blue-gray GnatcatcherPolioptilidae132025+275%1975
Fish CrowCorvidae132025+567%1979
House FinchFringillidae132025+340%1984
Red-eyed VireoVireonidae112025+86%1968
Grasshopper SparrowPasserellidae102025+53%1968
Purple MartinHirundinidae102025+667%1968
Tree SwallowHirundinidae102014+91%1999
Rock PigeonColumbidae92025-36%1968
Great Crested FlycatcherTyrannidae92025+39%1968
Cedar WaxwingBombycillidae82025+46%2001
Downy WoodpeckerPicidae72025+30%1970
Horned LarkAlaudidae72025+29%1968
Blue GrosbeakCardinalidae72025+271%1968
Wild TurkeyPhasianidae72025+600%1991
Chimney SwiftApodidae62025-60%1968
Brown ThrasherMimidae62025-40%1968
Double-crested CormorantPhalacrocoracidae62007n/an/a

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