BirdAnalyst
BBS Route · Delaware · BCR 30

Holleyville 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 88 species recorded across 10 survey years, still active.

88Species 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 →
10Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2006–2024Span
2Observers

Bird Species Found on Delaware Holleyville 2

Top 40 of 88 species by most recent count. Each links to its species trend.

Species recorded on the Holleyville 2 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 StarlingSturnidae2482024-9%2008
Canada GooseAnatidae1462024+48%2008
American RobinTurdidae682024-26%2008
Common GrackleIcteridae652024-74%2008
Turkey VultureCathartidae602024+119%2008
American CrowCorvidae482024-63%2008
Carolina WrenTroglodytidae472024-10%2008
Northern MockingbirdMimidae362024+4%2008
Mourning DoveColumbidae352024+26%2008
Blue GrosbeakCardinalidae342024-23%2008
Chipping SparrowPasserellidae332024-41%2008
Barn SwallowHirundinidae312024+49%2008
Indigo BuntingCardinalidae292024-61%2008
Northern CardinalCardinalidae272024-53%2008
Purple MartinHirundinidae262024+225%2008
Laughing GullLaridae212024+393%2008
Brown-headed CowbirdIcteridae182024-56%2008
House FinchFringillidae182024+80%2008
Blue JayCorvidae162024-68%2008
Horned LarkAlaudidae132024-84%2008
Red-winged BlackbirdIcteridae132024-65%2008
House SparrowPasseridae122024-22%2008
Tufted TitmouseParidae122024-70%2008
Eastern KingbirdTyrannidae112019-5%2008
Boat-tailed GrackleIcteridae102009+900%2006
Eastern BluebirdTurdidae102024-17%2008
Yellow-billed CuckooCuculidae92019+250%2008
Red-eyed VireoVireonidae92024-20%2008
Song SparrowPasserellidae82024-39%2008
KilldeerCharadriidae72024-30%2008
Rock PigeonColumbidae72024-58%2008
Great Crested FlycatcherTyrannidae72024-37%2008
American GoldfinchFringillidae72024-30%2008
Field SparrowPasserellidae72024-55%2008
Pine WarblerParulidae72024+56%2009
Carolina ChickadeeParidae72024-52%2008
Fish CrowCorvidae62024-44%2008
MallardAnatidae52019+0%2006
Grasshopper SparrowPasserellidae52024+11%2008
Summer TanagerCardinalidae52024+50%2016

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