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BBS Route · California · BCR 32

Pennington Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 102 species recorded across 35 survey years, still active.

102Species 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 →
35Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1971–2024Span
7Observers

Bird Species Found on California Pennington

Top 40 of 102 species by most recent count. Each links to its species trend.

Species recorded on the Pennington 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
Cliff SwallowHirundinidae4842024-51%1973
House FinchFringillidae1002024+53%1973
Red-winged BlackbirdIcteridae712024+109%1973
Mourning DoveColumbidae602024+31%1973
European StarlingSturnidae522024-40%1973
American White PelicanPelecanidae502024+59%2009
House SparrowPasseridae492024+43%1973
American RobinTurdidae292024+178%1973
Tricolored BlackbirdIcteridae252014-92%1973
Brewer's BlackbirdIcteridae232024-86%1973
Lesser GoldfinchFringillidae222024+718%1973
Western KingbirdTyrannidae172024-37%1973
Brown-headed CowbirdIcteridae172024+257%1973
California QuailOdontophoridae152024+89%1973
Turkey VultureCathartidae142024+115%1973
American GoldfinchFringillidae142024-5%1973
Oak TitmouseParidae142024-31%1973
Rock PigeonColumbidae132024+111%1975
Northern MockingbirdMimidae112024+48%1973
Eurasian Collared-DoveColumbidae112024-28%2017
Barn SwallowHirundinidae92024-65%1973
Northern PintailAnatidae91981-9%1979
KilldeerCharadriidae82024-66%1973
American CrowCorvidae82024+11%1973
Western MeadowlarkIcteridae82024-89%1973
Great Horned OwlStrigidae82014+0%1985
Black-chinned HummingbirdTrochilidae82015+67%1987
Acorn WoodpeckerPicidae72024+17%1973
White-faced IbisThreskiornithidae72014+320%1991
Tree SwallowHirundinidae62024+31%1973
Bewick's WrenTroglodytidae62024-35%1973
Western Wood-PeweeTyrannidae62024+200%1978
California GullLaridae61995n/an/a
California Scrub-JayCorvidae52024-58%1973
Great EgretArdeidae52024+67%1980
Cinnamon TealAnatidae52008+88%1985
Bullock's OrioleIcteridae42024-72%1973
Black-headed GrosbeakCardinalidae42024+100%1973
Rock WrenTroglodytidae41976n/an/a
Red-shouldered HawkAccipitridae42022+60%2004

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