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BBS Route · California · BCR 32

Westley Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 101 species recorded across 46 survey years, still active.

101Species 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 →
46Years 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
4Observers

Bird Species Found on California Westley

Top 40 of 101 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 SwallowHirundinidae5792025-22%1975
European StarlingSturnidae2852025+116%1975
House FinchFringillidae1132025+40%1975
Brewer's BlackbirdIcteridae662025-68%1975
House SparrowPasseridae562025+400%1975
Eurasian Collared-DoveColumbidae532025+282%2009
American RobinTurdidae472025+168%1975
Mourning DoveColumbidae352025+46%1975
Barn SwallowHirundinidae352025+482%1976
Red-winged BlackbirdIcteridae282025-72%1975
California Scrub-JayCorvidae262025+425%1976
American CrowCorvidae232025-58%1975
Northern MockingbirdMimidae222025+317%1975
Western KingbirdTyrannidae212025+147%1975
American GoldfinchFringillidae202025+394%1987
Swainson's HawkAccipitridae152025+700%1987
American White PelicanPelecanidae152017+50%2008
Yellow-billed MagpieCorvidae142025-76%1975
White-faced IbisThreskiornithidae142023+219%1998
Lesser GoldfinchFringillidae102025+167%2000
Black-necked StiltRecurvirostridae92025+225%1977
KilldeerCharadriidae92025+30%1975
Brown-headed CowbirdIcteridae92025+700%1979
Snowy EgretArdeidae92021+225%2002
Red-tailed HawkAccipitridae82025+525%1976
California GullLaridae82017n/an/a
Black PhoebeTyrannidae72025+600%1977
Turkey VultureCathartidae72025+200%2000
Canada GooseAnatidae62025-62%2015
MallardAnatidae52025-79%1975
Rock PigeonColumbidae52025-52%1975
Anna's HummingbirdTrochilidae52025+40%1992
Great Blue HeronArdeidae42025+0%1976
American KestrelFalconidae42025-29%1975
Yellow-headed BlackbirdIcteridae41996+133%1974
Tree SwallowHirundinidae42025+133%1978
Common RavenCorvidae42025+980%2002
Western Cattle-EgretArdeidae42005n/an/a
California QuailOdontophoridae32025+50%1975
Acorn WoodpeckerPicidae31977+200%1972

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