BirdAnalyst
BBS Route · California · BCR 33

Anza Borrego Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 79 species recorded across 50 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 →
50Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2025Span
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
House FinchFringillidae712025+74%1970
Cactus WrenTroglodytidae322025+265%1970
White-winged DoveColumbidae212025+269%1970
Black-throated SparrowPasserellidae212025+88%1970
Mourning DoveColumbidae172025+34%1970
Common RavenCorvidae172025+440%1970
Vaux's SwiftApodidae121990n/an/a
California QuailOdontophoridae112025+3%1970
House SparrowPasseridae92025+29%1971
VerdinRemizidae92025+5%1970
PhainopeplaPtiliogonatidae92025+900%1971
Rock PigeonColumbidae81996n/an/a
Ash-throated FlycatcherTyrannidae72025+300%1971
Bell's VireoVireonidae72025+240%2000
Warbling VireoVireonidae61990+500%1985
Red-tailed HawkAccipitridae52025+225%1970
Brewer's BlackbirdIcteridae52012+60%1987
Wilson's WarblerParulidae51990+20%1986
Yellow WarblerParulidae52025+133%2000
Greater RoadrunnerCuculidae42025+17%1972
Costa's HummingbirdTrochilidae42025+200%1970
Bewick's WrenTroglodytidae42025+267%1976
Horned LarkAlaudidae42023-29%1973
Hooded OrioleIcteridae42025+22%1971
Red-winged BlackbirdIcteridae42022+50%1990
Scott's OrioleIcteridae32025-17%1970
Loggerhead ShrikeLaniidae32025-80%1970
Brown-headed CowbirdIcteridae32025-33%1985
Western TanagerCardinalidae31993+0%1986
Great-tailed GrackleIcteridae32025-50%2006
Turkey VultureCathartidae32025+60%2012
Rock WrenTroglodytidae22023-39%1970
Lesser NighthawkCaprimulgidae22025+100%1971
California ThrasherMimidae22023+0%1973
Lark SparrowPasserellidae21998+0%1976
Lawrence's GoldfinchFringillidae22025-14%1992
Bullock's OrioleIcteridae22023-33%1986
American CrowCorvidae22019+50%2014
California Scrub-JayCorvidae22025+33%2013
Eurasian Collared-DoveColumbidae22025+43%2013

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