BirdAnalyst
BBS Route · California · BCR 32

Westley Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 100 species recorded across 45 survey years, still active.

100Species 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 →
45Years 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
4Observers

Bird Species Found on California Westley

Top 40 of 100 species by most recent count. Each links to its species trend.

Species recorded on the Westley 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
Cliff SwallowHirundinidae2072024-53%1975
House FinchFringillidae1492024+44%1975
European StarlingSturnidae1282024+40%1975
Brewer's BlackbirdIcteridae832024-63%1975
Tricolored BlackbirdIcteridae702023+55%1977
House SparrowPasseridae672024+504%1975
Eurasian Collared-DoveColumbidae422024+200%2009
Mourning DoveColumbidae342024+47%1975
Northern MockingbirdMimidae332024+339%1975
American GoldfinchFringillidae332024+431%1987
Barn SwallowHirundinidae312024+441%1976
American RobinTurdidae272024+78%1975
Western KingbirdTyrannidae252024+159%1975
California Scrub-JayCorvidae232024+283%1976
American CrowCorvidae192024-59%1975
American White PelicanPelecanidae152017+50%2008
White-faced IbisThreskiornithidae142023+219%1998
Swainson's HawkAccipitridae132024+560%1987
Black PhoebeTyrannidae122024+640%1977
Yellow-billed MagpieCorvidae112024-76%1975
Common RavenCorvidae11202413×2002
Double-crested CormorantPhalacrocoracidae102024+160%2000
Snowy EgretArdeidae92021+225%2002
Red-tailed HawkAccipitridae82024+675%1976
Red-winged BlackbirdIcteridae82024-82%1975
Tree SwallowHirundinidae82024+133%1978
Great EgretArdeidae82024-18%1977
White-throated SwiftApodidae82019+175%2008
Canada GooseAnatidae82022-67%2011
California GullLaridae82017n/an/a
Brown-headed CowbirdIcteridae72024+775%1979
BushtitAegithalidae72024+106%1987
KilldeerCharadriidae62024+22%1975
Lark SparrowPasserellidae52024+300%1989
Lesser GoldfinchFringillidae52024+111%2000
California QuailOdontophoridae42024+220%1975
Yellow-headed BlackbirdIcteridae41996+133%1974
Western Cattle-EgretArdeidae42005n/an/a
Acorn WoodpeckerPicidae31977+200%1972
Spotted TowheePasserellidae32024+50%1987

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