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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 52 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 →
52Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2025Span
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 PigeonColumbidae632025+636%1975
House FinchFringillidae512025+4%1974
Western GullLaridae501990n/an/a
American CrowCorvidae492025+103%1974
European StarlingSturnidae432025+36%1974
Red-winged BlackbirdIcteridae422025-45%1974
California TowheePasserellidae322025+50%1974
Cliff SwallowHirundinidae282025+347%1974
Eurasian Collared-DoveColumbidae262025+454%2009
Turkey VultureCathartidae242025+353%1974
Oak TitmouseParidae222025+208%1974
Northern MockingbirdMimidae212025+14%1974
Common RavenCorvidae212025+486%1977
Acorn WoodpeckerPicidae172025+138%1974
Ruddy DuckAnatidae151978n/an/a
Lesser GoldfinchFringillidae132025-67%1974
Spotted TowheePasserellidae132025+19%1974
California Scrub-JayCorvidae122025-69%1974
House SparrowPasseridae122025-91%1974
Song SparrowPasserellidae112025+9%1974
Brewer's BlackbirdIcteridae102025-97%1974
Barn SwallowHirundinidae92025-84%1974
Violet-green SwallowHirundinidae92025+113%1974
MallardAnatidae82025-55%1975
Mourning DoveColumbidae82025-11%1974
California QuailOdontophoridae72025-70%1974
American GoldfinchFringillidae72025+0%1978
Brown-headed CowbirdIcteridae62025+100%1974
American RobinTurdidae62025+32%1974
Red-shouldered HawkAccipitridae62025+367%1975
Bewick's WrenTroglodytidae62025+213%1975
Black PhoebeTyrannidae52025+100%1975
BushtitAegithalidae52025-60%1974
Hermit ThrushTurdidae51975-14%1973
Chestnut-backed ChickadeeParidae52025-17%1979
Steller's JayCorvidae42025-61%1974
Bullock's OrioleIcteridae42025-64%1974
Pine SiskinFringillidae42024+56%1976
Western BluebirdTurdidae42025+150%1975

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