BirdAnalyst
BBS Route · Delaware · BCR 30

Holleyville Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 114 species recorded across 37 survey years, no longer active.

114Species 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 →
37Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2004Span
7Observers

Bird Species Found on Delaware Holleyville

Top 40 of 114 species by most recent count. Each links to its species trend.

Species recorded on the Holleyville 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 GrackleIcteridae2042004+94%1968
European StarlingSturnidae1232004+120%1968
Turkey VultureCathartidae712004+571%1969
American RobinTurdidae632004+142%1968
Indigo BuntingCardinalidae622004+390%1968
House SparrowPasseridae612004-45%1968
Chipping SparrowPasserellidae562004+62%1968
Mourning DoveColumbidae542004+120%1968
Northern CardinalCardinalidae492004+185%1968
Carolina WrenTroglodytidae412004+611%1969
American CrowCorvidae392004+127%1968
Northern MockingbirdMimidae392004+174%1968
Blue GrosbeakCardinalidae372004+460%1968
Rock PigeonColumbidae342004+854%1969
Tufted TitmouseParidae332004+122%1968
Canada GooseAnatidae33200413×1990
Blue JayCorvidae272004+103%1968
Brown-headed CowbirdIcteridae272004+324%1968
Barn SwallowHirundinidae272004+3%1968
Horned LarkAlaudidae222004+326%1968
Song SparrowPasserellidae192004+271%1968
Red-eyed VireoVireonidae192004+146%1968
Purple MartinHirundinidae182004+611%1972
Cedar WaxwingBombycillidae162004+52%1997
American GoldfinchFringillidae152004+783%1970
House FinchFringillidae122004+720%1991
Fish CrowCorvidae112004+567%1970
Red-winged BlackbirdIcteridae102004+104%1968
Wood ThrushTurdidae102004+19%1968
Pine WarblerParulidae92004+80%1968
Gray CatbirdMimidae92004+47%1968
Eastern BluebirdTurdidae92004+375%1973
OvenbirdParulidae82004+85%1968
Yellow-billed CuckooCuculidae72004+50%1968
Carolina ChickadeeParidae72004+159%1968
Great Blue HeronArdeidae72004+300%1972
Chimney SwiftApodidae62004+41%1968
Eastern KingbirdTyrannidae62004+56%1969
Great Crested FlycatcherTyrannidae62004+163%1968
Orchard OrioleIcteridae62004+467%1969

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