BirdAnalyst
BBS Route · California · BCR 15

Westville Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 89 species recorded across 38 survey years, still active.

89Species 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 →
38Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1971–2024Span
7Observers

Bird Species Found on California Westville

Top 40 of 89 species by most recent count. Each links to its species trend.

Species recorded on the Westville 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
Fox SparrowPasserellidae482024-59%1974
Red-breasted NuthatchSittidae472024+14%1974
Western TanagerCardinalidae302024-73%1974
Mountain ChickadeeParidae242024-29%1974
American RobinTurdidae202024-32%1974
Western Wood-PeweeTyrannidae192024-41%1974
Spotted TowheePasserellidae152024-34%1974
Brown CreeperCerthiidae152024+91%1974
Mountain QuailOdontophoridae142024-50%1974
Steller's JayCorvidae122024-51%1974
Green-tailed TowheePasserellidae122024-41%1974
Warbling VireoVireonidae102024-23%1974
Olive-sided FlycatcherTyrannidae92024-64%1974
Cassin's VireoVireonidae92024-60%1974
Hermit WarblerParulidae92024-67%1974
Black-headed GrosbeakCardinalidae72024-64%1974
Pygmy NuthatchSittidae71976n/an/a
Chipping SparrowPasserellidae62024-78%1974
Golden-crowned KingletRegulidae62024-36%1974
Hairy WoodpeckerPicidae52024+67%1974
Anna's HummingbirdTrochilidae52022+133%1981
Purple FinchFringillidae52024-46%1974
Nashville WarblerParulidae52024-83%1974
Black-throated Gray WarblerParulidae52024-10%1974
Common RavenCorvidae52024+280%2006
Band-tailed PigeonColumbidae42024-61%1975
Violet-green SwallowHirundinidae42022-88%1972
Chestnut-backed ChickadeeParidae42024+60%1999
Rufous HummingbirdTrochilidae31972+200%1971
Dusky FlycatcherTyrannidae32024-53%1974
Cassin's FinchFringillidae32021-71%1974
Orange-crowned WarblerParulidae32024-83%1974
Yellow WarblerParulidae32024-95%1974
White-breasted NuthatchSittidae32024+20%1975
Townsend's SolitaireTurdidae32023-22%1978
Red-tailed HawkAccipitridae32021+20%1986
Wilson's WarblerParulidae32021+100%1977
Pacific WrenTroglodytidae32024+200%1979
California QuailOdontophoridae32006n/an/a
Mourning DoveColumbidae22022+125%1977

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