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BBS Route · California · BCR 15

Greenhorn Mt Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 105 species recorded across 27 survey years, still active.

105Species 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 →
27Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1971–2008Span
6Observers

Bird Species Found on California Greenhorn Mt

Top 40 of 105 species by most recent count. Each links to its species trend.

Species recorded on the Greenhorn Mt 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
Acorn WoodpeckerPicidae602008+5%1974
Mountain ChickadeeParidae372008+4%1974
Western Wood-PeweeTyrannidae362008-65%1974
Fox SparrowPasserellidae322008+42%1974
Western TanagerCardinalidae322008+18%1974
Black-headed GrosbeakCardinalidae282008-39%1974
Steller's JayCorvidae262008-17%1974
Bullock's OrioleIcteridae242008-31%1974
Spotted TowheePasserellidae222008+95%1974
Red-breasted NuthatchSittidae202008-39%1974
Purple FinchFringillidae182008-10%1975
Oak TitmouseParidae172008+16%1974
BushtitAegithalidae172006+450%1976
Common RavenCorvidae162008-11%1976
Mourning DoveColumbidae132008-74%1974
Golden-crowned KingletRegulidae132008+50%1974
Dusky FlycatcherTyrannidae122008+200%1976
Lesser GoldfinchFringillidae122008-70%1974
Brown CreeperCerthiidae122008-45%1974
California QuailOdontophoridae92008+16%1974
California Scrub-JayCorvidae82008-14%1974
House FinchFringillidae82008-66%1974
Ash-throated FlycatcherTyrannidae72008-86%1974
California TowheePasserellidae72008+50%1974
Nashville WarblerParulidae72008-52%1976
Northern House WrenTroglodytidae72008-42%1974
American GoldfinchFringillidae71980+600%1974
European StarlingSturnidae62008-80%1974
MacGillivray's WarblerParulidae62008+0%1974
Wilson's WarblerParulidae61982+133%1976
Red-tailed HawkAccipitridae52008+325%1974
White-headed WoodpeckerPicidae52008-50%1974
Red-breasted SapsuckerPicidae52008+38%1974
Brown-headed CowbirdIcteridae52008-42%1974
Red CrossbillFringillidae51996+543%1988
Chipping SparrowPasserellidae52008-95%1974
White-breasted NuthatchSittidae52008+0%1974
American RobinTurdidae52008-48%1974
Cliff SwallowHirundinidae51980n/an/a
Mountain QuailOdontophoridae42008-67%1974

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