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BBS Route · California · BCR 32

Mark West Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 114 species recorded across 51 survey years, still active.

114Species 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 →
51Years 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
6Observers

Bird Species Found on California Mark West

Top 40 of 114 species by most recent count. Each links to its species trend.

Species recorded on the Mark West 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
Tricolored BlackbirdIcteridae140199213×1976
Rock PigeonColumbidae872024+600%1975
Western GullLaridae501990n/an/a
House FinchFringillidae482024+3%1974
American CrowCorvidae442024+96%1974
California TowheePasserellidae422024+43%1974
Cliff SwallowHirundinidae412024+295%1974
European StarlingSturnidae322024+17%1974
Turkey VultureCathartidae232024+347%1974
Northern MockingbirdMimidae202024+24%1974
American RobinTurdidae172024+64%1974
House SparrowPasseridae152024-89%1974
Ruddy DuckAnatidae151978n/an/a
Eurasian Collared-DoveColumbidae152024+415%2009
Acorn WoodpeckerPicidae132024+113%1974
Western BluebirdTurdidae132024+160%1975
Spotted TowheePasserellidae122024+19%1974
Common RavenCorvidae122024+300%1977
Mourning DoveColumbidae112024+9%1974
Song SparrowPasserellidae102024+9%1974
BushtitAegithalidae102024-58%1974
Bewick's WrenTroglodytidae102024+188%1975
California Scrub-JayCorvidae92024-62%1974
Red-winged BlackbirdIcteridae82024-74%1974
Brewer's BlackbirdIcteridae82024-96%1974
Oak TitmouseParidae82024+108%1974
Chestnut-backed ChickadeeParidae82024-6%1979
Anna's HummingbirdTrochilidae72024+233%1976
California QuailOdontophoridae62024-72%1974
Nuttall's WoodpeckerPicidae62024-17%1974
Steller's JayCorvidae62024-64%1974
Red-tailed HawkAccipitridae52024+0%1977
Hermit ThrushTurdidae51975-14%1973
Wild TurkeyPhasianidae52024+263%1999
Black PhoebeTyrannidae42024+163%1975
Lesser GoldfinchFringillidae42024-69%1974
Barn SwallowHirundinidae42024-81%1974
Pine SiskinFringillidae42024+56%1976
White-breasted NuthatchSittidae42024+167%1977
American CootRallidae41978+300%1976

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