BirdAnalyst
BBS Route · California · BCR 32

Calpella Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 93 species recorded across 16 survey years, no longer active.

93Species 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 →
16Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–1986Span
4Observers

Bird Species Found on California Calpella

Top 40 of 93 species by most recent count. Each links to its species trend.

Species recorded on the Calpella 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
Brewer's BlackbirdIcteridae351986+4%1970
Acorn WoodpeckerPicidae241986-57%1970
Steller's JayCorvidae231986+11%1970
Spotted TowheePasserellidae221986+14%1970
House FinchFringillidae211986-6%1970
Cedar WaxwingBombycillidae201968n/an/a
California Scrub-JayCorvidae171986-21%1970
American CrowCorvidae161986+105%1970
Cliff SwallowHirundinidae161986-61%1972
California TowheePasserellidae131986+51%1970
European StarlingSturnidae101986+111%1970
House SparrowPasseridae101986-3%1970
Oak TitmouseParidae101986+87%1970
Brown-headed CowbirdIcteridae81982+150%1970
Lesser GoldfinchFringillidae81986+177%1971
Western TanagerCardinalidae81986+271%1970
Cassin's VireoVireonidae81986+240%1971
White-breasted NuthatchSittidae81986+200%1970
WrentitSylviidae81986+83%1970
Rock PigeonColumbidae81986-29%1975
Western KingbirdTyrannidae71986+78%1970
Warbling VireoVireonidae71986+38%1970
Tree SwallowHirundinidae61986-18%1970
Chipping SparrowPasserellidae51982+175%1971
Swainson's ThrushTurdidae51981-33%1970
American RobinTurdidae51986+6%1970
Hermit ThrushTurdidae51986-50%1978
White-tailed KiteAccipitridae51981+150%1978
Black-headed GrosbeakCardinalidae41986-7%1970
Hutton's VireoVireonidae41986+29%1970
Western BluebirdTurdidae41986+183%1972
Wilson's WarblerParulidae41986+143%1971
Mountain QuailOdontophoridae31986+44%1970
Common RavenCorvidae31986+200%1973
Orange-crowned WarblerParulidae31986-15%1970
Red-shouldered HawkAccipitridae31986+100%1977
Red-breasted SapsuckerPicidae31986+100%1980
Pygmy NuthatchSittidae31980+0%1978
KilldeerCharadriidae21986+0%1970
California QuailOdontophoridae21986-22%1970

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