BirdAnalyst
BBS Route · California · BCR 15

Westville Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 89 species recorded across 39 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 →
39Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1971–2025Span
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
Mountain QuailOdontophoridae552025+92%1974
Red-breasted NuthatchSittidae362025-3%1974
Fox SparrowPasserellidae342025-62%1974
American RobinTurdidae302025-38%1974
Mountain ChickadeeParidae252025-36%1974
Western Wood-PeweeTyrannidae242025-31%1974
Western TanagerCardinalidae242025-67%1974
Red CrossbillFringillidae232025+4%1996
Spotted TowheePasserellidae202025-38%1974
Band-tailed PigeonColumbidae192025-11%1975
Brown CreeperCerthiidae182025+70%1974
Black-headed GrosbeakCardinalidae172025-46%1974
Dusky FlycatcherTyrannidae162025-38%1974
Chipping SparrowPasserellidae162025-69%1974
Hermit WarblerParulidae142025-60%1974
Olive-sided FlycatcherTyrannidae132025-64%1974
Steller's JayCorvidae132025-59%1974
Common RavenCorvidae122025+340%2006
Hermit ThrushTurdidae112025-60%1974
Green-tailed TowheePasserellidae102025-42%1974
Golden-crowned KingletRegulidae102025-51%1974
Cassin's VireoVireonidae92025-46%1974
Warbling VireoVireonidae82025-18%1974
Lazuli BuntingCardinalidae72025+44%1978
Pygmy NuthatchSittidae71976n/an/a
White-headed WoodpeckerPicidae52025+143%1974
Cassin's FinchFringillidae52025-71%1974
Purple FinchFringillidae42025-42%1974
Violet-green SwallowHirundinidae42022-88%1972
Nashville WarblerParulidae42025-86%1974
Yellow WarblerParulidae42025-92%1974
MacGillivray's WarblerParulidae42025-83%1974
Mourning DoveColumbidae32025+175%1977
Rufous HummingbirdTrochilidae31972+200%1971
Brown-headed CowbirdIcteridae32025-40%1974
Black-throated Gray WarblerParulidae32025+10%1974
Townsend's SolitaireTurdidae32025-22%1978
Wilson's WarblerParulidae32021+100%1977
Pacific WrenTroglodytidae32025+233%1979
California QuailOdontophoridae32006n/an/a

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