BirdAnalyst
BBS Route · California · BCR 32

Cohasset Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 121 species recorded across 44 survey years, still active.

121Species 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 →
44Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2025Span
4Observers

Bird Species Found on California Cohasset

Top 40 of 121 species by most recent count. Each links to its species trend.

Species recorded on the Cohasset 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
European StarlingSturnidae902025+40%1974
House FinchFringillidae442025+78%1974
Lazuli BuntingCardinalidae39202512×2012
American GoldfinchFringillidae292025+600%1977
Spotted TowheePasserellidae282025-5%1974
Eurasian Collared-DoveColumbidae272025+151%2012
Lesser GoldfinchFringillidae222025+84%1974
Western TanagerCardinalidae212025+123%1974
Ash-throated FlycatcherTyrannidae192025+129%1975
Black-headed GrosbeakCardinalidae172025+48%1974
Cliff SwallowHirundinidae162025-89%1974
American RobinTurdidae162025+57%1974
Mourning DoveColumbidae152025-35%1974
Acorn WoodpeckerPicidae152025+22%1974
California Scrub-JayCorvidae152025+18%1974
House SparrowPasseridae152025-43%1974
Northern MockingbirdMimidae152025+146%1975
California TowheePasserellidae152025+131%1975
Brown-headed CowbirdIcteridae142025+60%1974
California QuailOdontophoridae132025+110%1974
Western KingbirdTyrannidae132025+16%1974
Orange-crowned WarblerParulidae122025+74%1976
American CrowCorvidae112025-43%1974
Yellow WarblerParulidae112021+260%1976
Yellow-billed MagpieCorvidae92025+7%1974
Western BluebirdTurdidae92025+111%1976
Chipping SparrowPasserellidae92025+325%1976
Turkey VultureCathartidae82025+191%1976
Oak TitmouseParidae82025+30%1974
Red-breasted NuthatchSittidae82025+317%1979
Common RavenCorvidae82025+767%1995
Purple FinchFringillidae72025+86%1974
Cassin's VireoVireonidae72024+50%1976
Canyon WrenTroglodytidae62023+60%1975
Nuttall's WoodpeckerPicidae52024+83%1974
Red-winged BlackbirdIcteridae52025-86%1974
Brewer's BlackbirdIcteridae52025-92%1974
Mountain ChickadeeParidae52024+20%1974
Western Wood-PeweeTyrannidae42025-60%1974
Steller's JayCorvidae42025+13%1974

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