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BBS Route · California · BCR 32

Anza Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 95 species recorded across 18 survey years, no longer active.

95Species 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 →
18Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1970–2004Span
8Observers

Bird Species Found on California Anza

Top 40 of 95 species by most recent count. Each links to its species trend.

Species recorded on the Anza 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
Brewer's BlackbirdIcteridae512004+54%1972
House FinchFringillidae412004+14%1972
California Scrub-JayCorvidae352004+14%1972
Cliff SwallowHirundinidae282004+19%1972
Common RavenCorvidae272004+165%1972
California TowheePasserellidae202004+113%1972
House SparrowPasseridae202004+70%1972
Ash-throated FlycatcherTyrannidae172004+159%1972
Lazuli BuntingCardinalidae161995+120%1979
Mourning DoveColumbidae152004+22%1972
Pinyon JayCorvidae151976+50%1974
California ThrasherMimidae112004+71%1972
Oak TitmouseParidae112004+129%1973
Spotted TowheePasserellidae102004+22%1972
Rock PigeonColumbidae102004+29%1979
Bewick's WrenTroglodytidae82004+260%1976
American CrowCorvidae82004+44%1975
Blue GrosbeakCardinalidae72004+200%1976
Red-tailed HawkAccipitridae72004+100%1974
Ruddy DuckAnatidae71975+17%1973
Mountain QuailOdontophoridae71991+60%1975
MallardAnatidae72004+600%1995
Cassin's KingbirdTyrannidae61981+500%1972
Lesser GoldfinchFringillidae62004+14%1974
Wilson's WarblerParulidae61981n/an/a
Grasshopper SparrowPasserellidae61995n/an/a
Red-winged BlackbirdIcteridae52004-10%1972
Western MeadowlarkIcteridae52004-58%1972
BushtitAegithalidae52004-47%1974
Lawrence's GoldfinchFringillidae52004-11%1981
Lark SparrowPasserellidae42004-33%1976
Nuttall's WoodpeckerPicidae42004+75%1979
PhainopeplaPtiliogonatidae42004+167%1975
Northern MockingbirdMimidae42004+100%1984
WrentitSylviidae42004-22%1975
Great Horned OwlStrigidae41974n/an/a
Ladder-backed WoodpeckerPicidae42004+67%1979
Scott's OrioleIcteridae41986-17%1981
Western KingbirdTyrannidae32004+67%1972
European StarlingSturnidae32004+314%1972

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