BirdAnalyst
BBS Route · California · BCR 33

Darwin Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 37 species recorded across 15 survey years, still active.

37Species 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 →
15Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1991–2012Span
3Observers

Bird Species Found on California Darwin

Top 37 of 37 species by most recent count. Each links to its species trend.

Species recorded on the Darwin 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
Black-throated SparrowPasserellidae142012-58%1993
House SparrowPasseridae132012+107%1995
Northern MockingbirdMimidae122005-43%1995
European StarlingSturnidae92005+350%1995
Horned LarkAlaudidae82005-52%1993
House FinchFringillidae62012-57%1993
Gambel's QuailOdontophoridae52005n/an/a
Western KingbirdTyrannidae42012+178%1993
Ash-throated FlycatcherTyrannidae42012-55%1993
Sage ThrasherMimidae42001+100%1993
Say's PhoebeTyrannidae32005-33%1993
ChukarPhasianidae32005-67%1998
Bewick's WrenTroglodytidae31998+200%1993
White-throated SwiftApodidae22012+20%1995
Common RavenCorvidae22012-50%1993
Loggerhead ShrikeLaniidae22004+0%1995
Great-tailed GrackleIcteridae22004+100%1998
Golden EagleAccipitridae21999n/an/a
Eurasian Collared-DoveColumbidae22012n/an/a
Mourning DoveColumbidae12012+156%1993
Rock WrenTroglodytidae12012-80%1993
VerdinRemizidae11991n/an/a
Blue-gray GnatcatcherPolioptilidae12005-50%1995
Red-tailed HawkAccipitridae12012-25%1995
Brown-headed CowbirdIcteridae12001-33%1993
Scott's OrioleIcteridae12004+50%1993
Brewer's SparrowPasserellidae12005-50%1992
Costa's HummingbirdTrochilidae12005-43%1998
LeConte's ThrasherMimidae12012+150%2000
Turkey VultureCathartidae11995n/an/a
PhainopeplaPtiliogonatidae12005+0%1999
Cactus WrenTroglodytidae12012+67%1998
Prairie FalconFalconidae12012+0%1996
Rock PigeonColumbidae12000-50%1997
American KestrelFalconidae12005+0%2000
Burrowing OwlStrigidae12001n/an/a
Great Blue HeronArdeidae12012n/an/a

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