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BBS Route · California · BCR 5

Korbel Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 102 species recorded across 36 survey years, still active.

102Species 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 →
36Years 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
9Observers

Bird Species Found on California Korbel

Top 40 of 102 species by most recent count. Each links to its species trend.

Species recorded on the Korbel 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
Swainson's ThrushTurdidae392024+46%1974
Steller's JayCorvidae262024-37%1974
Spotted TowheePasserellidae152024+192%1975
Wilson's WarblerParulidae152024-60%1974
Band-tailed PigeonColumbidae122024+187%1974
Warbling VireoVireonidae122024-70%1974
BushtitAegithalidae122024+520%1976
Western Wood-PeweeTyrannidae112024-56%1974
Song SparrowPasserellidae112024-64%1974
Black-throated Gray WarblerParulidae112024+33%1974
Chestnut-backed ChickadeeParidae112024-35%1974
American RobinTurdidae112024-62%1974
California QuailOdontophoridae102024-70%1974
Northern Rough-winged SwallowHirundinidae102021+300%1979
Ruby-crowned KingletRegulidae91987+175%1982
California Scrub-JayCorvidae72024+6%1974
Western TanagerCardinalidae72024-54%1974
Hutton's VireoVireonidae72024-30%1974
Cliff SwallowHirundinidae72024+300%1979
Red CrossbillFringillidae62014+200%1973
Acorn WoodpeckerPicidae52024-56%1974
Golden-crowned KingletRegulidae52024-46%1974
Cassin's VireoVireonidae52024+0%1975
Red-winged BlackbirdIcteridae52024+33%1977
Turkey VultureCathartidae42023-36%1977
Red-breasted SapsuckerPicidae42021-43%1975
House FinchFringillidae42018+50%1978
Pine SiskinFringillidae41994-83%1974
White-crowned SparrowPasserellidae42024-47%1974
Black-headed GrosbeakCardinalidae42024-83%1974
Orange-crowned WarblerParulidae42024-53%1974
MacGillivray's WarblerParulidae42024+88%1976
WrentitSylviidae42024+127%1974
Hairy WoodpeckerPicidae42024+100%1981
Mountain QuailOdontophoridae32021-63%1974
Common RavenCorvidae32024-14%1974
Lazuli BuntingCardinalidae32024-46%1974
Barn SwallowHirundinidae32024-80%1974
Red-breasted NuthatchSittidae32024+11%1974
Red-shouldered HawkAccipitridae32021+100%2013

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