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BBS Route · California · BCR 33

Willow Spgs Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 45 species recorded across 11 survey years, no longer active.

45Species 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 →
11Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–1981Span
3Observers

Bird Species Found on California Willow Spgs

Top 40 of 45 species by most recent count. Each links to its species trend.

Species recorded on the Willow Spgs 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
Horned LarkAlaudidae1291981-30%1970
House FinchFringillidae1121981-36%1970
House SparrowPasseridae951981+9%1970
Common RavenCorvidae901981+59%1970
Black-throated SparrowPasserellidae761981-11%1970
Brewer's BlackbirdIcteridae521981+152%1971
European StarlingSturnidae311981+663%1970
Mourning DoveColumbidae221981-81%1970
Western MeadowlarkIcteridae171981+47%1970
California QuailOdontophoridae151981+100%1975
LeConte's ThrasherMimidae131981+50%1970
Cactus WrenTroglodytidae121981-70%1970
Brewer's SparrowPasserellidae111977-50%1976
Loggerhead ShrikeLaniidae101981-83%1970
Western KingbirdTyrannidae81981-20%1970
Bewick's WrenTroglodytidae81981+100%1969
Western TanagerCardinalidae81971n/an/a
Scott's OrioleIcteridae71981-26%1970
Northern MockingbirdMimidae71981-66%1970
Yellow WarblerParulidae71971+600%1969
Lesser NighthawkCaprimulgidae41975-29%1970
Costa's HummingbirdTrochilidae41977+300%1971
Gambel's QuailOdontophoridae41974-33%1973
Brown-headed CowbirdIcteridae31976+17%1972
ChukarPhasianidae31974n/an/a
Ash-throated FlycatcherTyrannidae21977+63%1970
Lawrence's GoldfinchFringillidae21976-61%1970
Black-headed GrosbeakCardinalidae21971n/an/a
Northern Rough-winged SwallowHirundinidae21972n/an/a
Lesser GoldfinchFringillidae21974n/an/a
Bell's SparrowPasserellidae21981-33%1975
Burrowing OwlStrigidae11981+13%1970
Greater RoadrunnerCuculidae11975-73%1970
Say's PhoebeTyrannidae11968n/an/a
Bullock's OrioleIcteridae11981-43%1970
Rock WrenTroglodytidae11977-14%1970
Golden EagleAccipitridae11969n/an/a
American KestrelFalconidae11976+0%1969
Red-tailed HawkAccipitridae11981-40%1972
Gray FlycatcherTyrannidae11971n/an/a

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