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BBS Route · California · BCR 32

Yolla Bolly Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 116 species recorded across 46 survey years, still active.

116Species 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 →
46Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1973–2024Span
6Observers

Bird Species Found on California Yolla Bolly

Top 40 of 116 species by most recent count. Each links to its species trend.

Species recorded on the Yolla Bolly 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 StarlingSturnidae1312024+263%1975
Acorn WoodpeckerPicidae902024+297%1975
Mourning DoveColumbidae522024-19%1975
Black SwiftApodidae481980n/an/a
Tricolored BlackbirdIcteridae432022+99%1979
Western MeadowlarkIcteridae402024-21%1975
Turkey VultureCathartidae372024+90%1975
California QuailOdontophoridae342024+330%1975
Ash-throated FlycatcherTyrannidae332024+29%1975
Cliff SwallowHirundinidae272024-88%1976
House FinchFringillidae242024+17%1975
Cedar WaxwingBombycillidae242002n/an/a
Western KingbirdTyrannidae232024-29%1975
White-breasted NuthatchSittidae222024+18%1976
Mountain ChickadeeParidae191973n/an/a
Lark SparrowPasserellidae182024+125%1975
Oak TitmouseParidae162024+43%1975
Western BluebirdTurdidae162024+141%1975
House SparrowPasseridae162023+300%1976
California Scrub-JayCorvidae142024+8%1975
Lesser GoldfinchFringillidae142024+29%1975
Bewick's WrenTroglodytidae132024-14%1976
Nuttall's WoodpeckerPicidae122024+65%1975
Dusky FlycatcherTyrannidae111973n/an/a
California TowheePasserellidae112024+100%1975
Eurasian Collared-DoveColumbidae112024+41%2012
Mountain QuailOdontophoridae102024-31%1976
WrentitSylviidae102024-55%1975
Brown-headed CowbirdIcteridae92024+100%1975
Common RavenCorvidae82024-44%1980
California ThrasherMimidae72024-20%1975
BushtitAegithalidae62021+69%1975
KilldeerCharadriidae62024-61%1976
American KestrelFalconidae62024-33%1976
American CrowCorvidae62023-10%1976
Blue-gray GnatcatcherPolioptilidae62023+14%1977
Yellow-billed MagpieCorvidae52023-86%1976
Pine SiskinFringillidae41973n/an/a
Brewer's BlackbirdIcteridae32024-76%1975
Fox SparrowPasserellidae31973n/an/a

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