BirdAnalyst
BBS Route · California · BCR 33

Pearblossom Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 99 species recorded across 45 survey years, still active.

99Species 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 →
45Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1970–2025Span
7Observers

Bird Species Found on California Pearblossom

Top 40 of 99 species by most recent count. Each links to its species trend.

Species recorded on the Pearblossom 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
House FinchFringillidae412025-42%1972
Common RavenCorvidae382025+390%1972
Red-winged BlackbirdIcteridae382025+527%1973
California QuailOdontophoridae292025+20%1972
House SparrowPasseridae202025+126%1973
PhainopeplaPtiliogonatidae202019+44%1977
Black-throated SparrowPasserellidae142025-81%1972
Ash-throated FlycatcherTyrannidae132025+100%1972
Brewer's BlackbirdIcteridae132025+171%1976
California Scrub-JayCorvidae122025-10%1972
Cactus WrenTroglodytidae112025-67%1972
Mourning DoveColumbidae102025-48%1972
Horned LarkAlaudidae82025-63%1972
Western MeadowlarkIcteridae82025+57%1972
Northern MockingbirdMimidae82025-25%1972
Bewick's WrenTroglodytidae62025-5%1972
Great-tailed GrackleIcteridae62025-19%2006
Western KingbirdTyrannidae52025-19%1973
Brown-headed CowbirdIcteridae52025+50%1972
Bell's SparrowPasserellidae52025+100%1997
Northern House WrenTroglodytidae52025+50%1973
American CootRallidae52025n/an/a
Lesser GoldfinchFringillidae42025+71%1977
Cliff SwallowHirundinidae4202512×2009
American KestrelFalconidae32024+167%1976
Red-tailed HawkAccipitridae32025-42%1975
Western Wood-PeweeTyrannidae32024+20%1977
Common YellowthroatParulidae32025+67%1997
Rock PigeonColumbidae32019-83%1985
Violet-green SwallowHirundinidae32016+150%2009
Yellow-headed BlackbirdIcteridae32024+0%2008
Black-chinned SparrowPasserellidae22025+25%1977
Spotted TowheePasserellidae22016-14%1972
California TowheePasserellidae22025+100%1975
Loggerhead ShrikeLaniidae22024-76%1972
California ThrasherMimidae22025+0%1972
VerdinRemizidae22025-53%1989
American CrowCorvidae22025-25%2016
Song SparrowPasserellidae22025+25%1981
Western TanagerCardinalidae21990+200%1972

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