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BBS Route · California · BCR 32

Glen Ellen Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 108 species recorded across 30 survey years, no longer active.

108Species 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 →
30Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2004Span
3Observers

Bird Species Found on California Glen Ellen

Top 40 of 108 species by most recent count. Each links to its species trend.

Species recorded on the Glen Ellen 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
House FinchFringillidae342004-64%1974
Orange-crowned WarblerParulidae302004-28%1974
Violet-green SwallowHirundinidae222004-54%1974
Spotted TowheePasserellidae202004-52%1974
Western BluebirdTurdidae202004-8%1974
European StarlingSturnidae172004+13%1974
Oak TitmouseParidae162004-17%1974
Chestnut-backed ChickadeeParidae162004-61%1974
Turkey VultureCathartidae142004+8%1974
Black-headed GrosbeakCardinalidae122004-35%1974
Steller's JayCorvidae112004+6%1974
California QuailOdontophoridae102004-41%1974
Acorn WoodpeckerPicidae102004+58%1974
California Scrub-JayCorvidae102004-33%1974
Lesser GoldfinchFringillidae92004-85%1974
American CrowCorvidae82004-54%1974
American RobinTurdidae82004-28%1974
Purple MartinHirundinidae81997+83%1994
Anna's HummingbirdTrochilidae72004-59%1974
Cliff SwallowHirundinidae72004+22%1974
Warbling VireoVireonidae72004-26%1974
American GoldfinchFringillidae72004+300%1991
Common RavenCorvidae62004+86%1976
Cassin's VireoVireonidae62004-31%1974
Downy WoodpeckerPicidae52002+120%1975
Red-winged BlackbirdIcteridae52004-62%1974
Northern Rough-winged SwallowHirundinidae52002-56%1974
Bewick's WrenTroglodytidae52004-76%1974
WrentitSylviidae52004-75%1974
Band-tailed PigeonColumbidae52004+18%1978
Mourning DoveColumbidae42004-75%1974
Nuttall's WoodpeckerPicidae42004-18%1974
Black PhoebeTyrannidae42004-36%1974
Olive-sided FlycatcherTyrannidae42004-74%1974
Black-throated Gray WarblerParulidae42003-29%1974
Cedar WaxwingBombycillidae41991-46%1985
MallardAnatidae41996+180%1980
American KestrelFalconidae31997+17%1975
Western KingbirdTyrannidae32003-33%1974
Ash-throated FlycatcherTyrannidae32004-77%1974

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