BirdAnalyst
BBS Route · California · BCR 32

Anza 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 94 species recorded across 20 survey years, still active.

94Species 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 →
20Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2005–2025Span
1Observers

Bird Species Found on California Anza 2

Top 40 of 94 species by most recent count. Each links to its species trend.

Species recorded on the Anza 2 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
California Scrub-JayCorvidae342025-2%2007
Yellow-headed BlackbirdIcteridae322005n/an/a
House SparrowPasseridae272025-17%2007
California TowheePasserellidae262025+8%2007
House FinchFringillidae252025-39%2007
Western MeadowlarkIcteridae222025+5%2007
Common RavenCorvidae212025+115%2007
Lesser GoldfinchFringillidae212025+4%2007
Red-winged BlackbirdIcteridae182025-18%2007
Spotted TowheePasserellidae172025-41%2007
European StarlingSturnidae142025-66%2007
Oak TitmouseParidae142025+77%2007
Mountain ChickadeeParidae142025+267%2007
Ash-throated FlycatcherTyrannidae132025+15%2007
Brewer's BlackbirdIcteridae122025-73%2007
American CrowCorvidae112025+150%2007
Eurasian Collared-DoveColumbidae112025+115%2011
Mourning DoveColumbidae92025+29%2007
Black-chinned SparrowPasserellidae92025+21%2007
California ThrasherMimidae92025+36%2007
Bewick's WrenTroglodytidae92025-21%2007
California QuailOdontophoridae82025-40%2008
Black-headed GrosbeakCardinalidae82025-24%2007
Acorn WoodpeckerPicidae72025+56%2007
Western KingbirdTyrannidae72025+88%2007
WrentitSylviidae72025-51%2007
Western Wood-PeweeTyrannidae62025-39%2007
Northern Rough-winged SwallowHirundinidae62005n/an/a
Pygmy NuthatchSittidae62025+23%2007
Western BluebirdTurdidae62025+200%2008
Say's PhoebeTyrannidae52025+300%2009
Steller's JayCorvidae52025+175%2009
Lark SparrowPasserellidae52025+117%2007
Northern MockingbirdMimidae52025+20%2007
BushtitAegithalidae52025-67%2007
Lazuli BuntingCardinalidae52025+157%2010
Horned LarkAlaudidae42025+10%2007
Lawrence's GoldfinchFringillidae42025-8%2007
Anna's HummingbirdTrochilidae42025+83%2008
Cassin's KingbirdTyrannidae42025+133%2017

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