BirdAnalyst
BBS Route · South Carolina · BCR 27

Holly Hill Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 101 species recorded across 41 survey years, still active.

101Species 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 →
41Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2024Span
4Observers

Bird Species Found on South Carolina Holly Hill

Top 40 of 101 species by most recent count. Each links to its species trend.

Species recorded on the Holly Hill 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
Northern CardinalCardinalidae682024-2%1974
Northern MockingbirdMimidae512024-7%1974
Mourning DoveColumbidae502024-29%1974
Carolina WrenTroglodytidae432024+103%1974
Barn SwallowHirundinidae40202413×1986
American CrowCorvidae312024-1%1974
Purple MartinHirundinidae262024+130%1976
Red-bellied WoodpeckerPicidae192024+36%1974
Blue JayCorvidae192024-63%1974
Brown-headed CowbirdIcteridae192024+264%1974
Tufted TitmouseParidae172024+69%1974
Eastern BluebirdTurdidae172024+580%1986
Painted BuntingCardinalidae152024+67%1974
Pine WarblerParulidae142024+120%1976
Carolina ChickadeeParidae142024+110%1974
Blue-gray GnatcatcherPolioptilidae142024+418%1974
Orchard OrioleIcteridae132024+250%1974
Brown ThrasherMimidae132024-19%1974
European StarlingSturnidae122024-65%1974
Common GrackleIcteridae122024-80%1974
House FinchFringillidae122024+167%2003
Blue GrosbeakCardinalidae112024+20%1974
Indigo BuntingCardinalidae112024-30%1974
Summer TanagerCardinalidae112024+77%1975
Great Crested FlycatcherTyrannidae102024+78%1974
Yellow-breasted ChatIcteriidae102024+77%1975
Eastern KingbirdTyrannidae92024-46%1974
White-eyed VireoVireonidae92024+141%1974
Turkey VultureCathartidae82024+600%1975
Downy WoodpeckerPicidae72024+133%1974
House SparrowPasseridae72024-90%1974
White IbisThreskiornithidae72024+96%1977
Great EgretArdeidae62024+14%1977
Chimney SwiftApodidae62024-30%1974
Eastern TowheePasserellidae62024-75%1974
Northern ParulaParulidae62024-58%1974
Western Cattle-EgretArdeidae52024-36%1974
Northern BobwhiteOdontophoridae52024-94%1974
Black VultureCathartidae52022+700%1974
Yellow-billed CuckooCuculidae52023-62%1974

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