BirdAnalyst
BBS Route · California · BCR 33

Anza Borrego Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 79 species recorded across 49 survey years, still active.

79Species 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 →
49Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2024Span
6Observers

Bird Species Found on California Anza Borrego

Top 40 of 79 species by most recent count. Each links to its species trend.

Species recorded on the Anza Borrego 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
Cactus WrenTroglodytidae512024+207%1970
House FinchFringillidae502024+24%1970
Black-throated SparrowPasserellidae222024+61%1970
White-winged DoveColumbidae132024+269%1970
Vaux's SwiftApodidae121990n/an/a
Mourning DoveColumbidae92024+66%1970
Costa's HummingbirdTrochilidae92024+190%1970
Ash-throated FlycatcherTyrannidae82024+283%1971
Yellow WarblerParulidae82024+200%2000
Rock PigeonColumbidae81996n/an/a
California QuailOdontophoridae72024-19%1970
Common RavenCorvidae72024+480%1970
PhainopeplaPtiliogonatidae72024+633%1971
VerdinRemizidae62024+5%1970
Warbling VireoVireonidae61990+500%1985
Brewer's BlackbirdIcteridae52012+60%1987
Wilson's WarblerParulidae51990+20%1986
Scott's OrioleIcteridae42024-25%1970
Loggerhead ShrikeLaniidae42024-84%1970
Bewick's WrenTroglodytidae42024+167%1976
Ladder-backed WoodpeckerPicidae42024+100%1972
Horned LarkAlaudidae42023-29%1973
Hooded OrioleIcteridae42024-11%1971
Red-winged BlackbirdIcteridae42022+50%1990
Say's PhoebeTyrannidae32024+167%1974
House SparrowPasseridae32024+6%1971
Black-tailed GnatcatcherPolioptilidae32024+0%1971
Lawrence's GoldfinchFringillidae32023-29%1992
Western TanagerCardinalidae31993+0%1986
Turkey VultureCathartidae32024+60%2012
Rock WrenTroglodytidae22023-39%1970
Lesser NighthawkCaprimulgidae22024+100%1971
California ThrasherMimidae22023+0%1973
Lark SparrowPasserellidae21998+0%1976
Lesser GoldfinchFringillidae22024-50%1981
Bullock's OrioleIcteridae22023-33%1986
Great-tailed GrackleIcteridae22019-67%2006
American CrowCorvidae22019+50%2014
Red-tailed HawkAccipitridae12024+125%1970
Greater RoadrunnerCuculidae12024+17%1972

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