BirdAnalyst
BBS Route · California · BCR 32

Yolla Bolly Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 116 species recorded across 47 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 →
47Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1973–2025Span
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 StarlingSturnidae1732025+397%1975
Acorn WoodpeckerPicidae1322025+353%1975
Cliff SwallowHirundinidae952025-67%1976
Mourning DoveColumbidae582025-6%1975
House SparrowPasseridae542025+270%1976
California QuailOdontophoridae502025+400%1975
Black SwiftApodidae481980n/an/a
Western MeadowlarkIcteridae452025-5%1975
Tricolored BlackbirdIcteridae432022+99%1979
Western KingbirdTyrannidae412025-25%1975
House FinchFringillidae372025+21%1975
Eurasian Collared-DoveColumbidae342025+37%2012
Ash-throated FlycatcherTyrannidae312025+21%1975
Lesser GoldfinchFringillidae272025+71%1975
Cedar WaxwingBombycillidae242002n/an/a
Oak TitmouseParidae202025+11%1975
Mountain ChickadeeParidae191973n/an/a
Turkey VultureCathartidae172025+75%1975
California Scrub-JayCorvidae172025-8%1975
White-breasted NuthatchSittidae172025-2%1976
Lark SparrowPasserellidae152025+144%1975
Northern MockingbirdMimidae142025+380%1976
Lawrence's GoldfinchFringillidae142025+150%2019
Nuttall's WoodpeckerPicidae132025+39%1975
Wild TurkeyPhasianidae132025+733%1995
Dusky FlycatcherTyrannidae111973n/an/a
California TowheePasserellidae112025+78%1975
Bewick's WrenTroglodytidae112025+2%1976
Mountain QuailOdontophoridae102024-31%1976
Western BluebirdTurdidae92025+82%1975
KilldeerCharadriidae92025-42%1976
Brewer's BlackbirdIcteridae82025-81%1975
WrentitSylviidae82025-56%1975
Brown-headed CowbirdIcteridae62025+85%1975
BushtitAegithalidae62021+69%1975
American RobinTurdidae62025+183%1975
American KestrelFalconidae62024-33%1976
Blue-gray GnatcatcherPolioptilidae62023+14%1977
Yellow-billed MagpieCorvidae52023-86%1976
Lazuli BuntingCardinalidae52025-70%1979

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