BirdAnalyst
BBS Route · California · BCR 32

Pennington Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 103 species recorded across 36 survey years, still active.

103Species 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 →
36Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1971–2025Span
7Observers

Bird Species Found on California Pennington

Top 40 of 103 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 SwallowHirundinidae3092025-37%1973
House FinchFringillidae1272025+47%1973
House SparrowPasseridae652025+62%1973
European StarlingSturnidae562025-12%1973
Red-winged BlackbirdIcteridae562025+116%1973
Mourning DoveColumbidae502025+21%1973
Western KingbirdTyrannidae352025-29%1973
Lesser GoldfinchFringillidae302025+700%1973
American RobinTurdidae262025+153%1973
Tricolored BlackbirdIcteridae252014-92%1973
California QuailOdontophoridae222025+142%1973
Brewer's BlackbirdIcteridae162025-90%1973
Eurasian Collared-DoveColumbidae152025-36%2017
California TowheePasserellidae132025+155%1973
Rock PigeonColumbidae132024+111%1975
American White PelicanPelecanidae132025+53%2009
Turkey VultureCathartidae122025+52%1973
Great-tailed GrackleIcteridae122025+55%2018
Western MeadowlarkIcteridae102025-91%1973
Bullock's OrioleIcteridae102025-76%1973
Northern PintailAnatidae91981-9%1979
California Scrub-JayCorvidae82025-58%1973
American CrowCorvidae82024+11%1973
Brown-headed CowbirdIcteridae82025+229%1973
American GoldfinchFringillidae82025-7%1973
Black-headed GrosbeakCardinalidae82025+188%1973
Black PhoebeTyrannidae82025+200%1975
Great Horned OwlStrigidae82014+0%1985
Black-chinned HummingbirdTrochilidae82015+67%1987
Ash-throated FlycatcherTyrannidae72025-27%1973
Northern MockingbirdMimidae72025+19%1973
White-faced IbisThreskiornithidae72014+320%1991
Barn SwallowHirundinidae62025-54%1973
Western Wood-PeweeTyrannidae62025+180%1978
California GullLaridae61995n/an/a
Spotted TowheePasserellidae52025+240%1973
Tree SwallowHirundinidae52025+39%1973
Great EgretArdeidae52025+117%1980
Cinnamon TealAnatidae52008+88%1985
Rock WrenTroglodytidae41976n/an/a

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