BirdAnalyst
BBS Route · California · BCR 32

Cohasset Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 120 species recorded across 43 survey years, still active.

120Species 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 →
43Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2024Span
4Observers

Bird Species Found on California Cohasset

Top 40 of 120 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
Lesser GoldfinchFringillidae582024+84%1974
European StarlingSturnidae532024-10%1974
House FinchFringillidae412024+84%1974
Acorn WoodpeckerPicidae372024+32%1974
Eurasian Collared-DoveColumbidae322024+134%2012
Cliff SwallowHirundinidae302024-90%1974
Ash-throated FlycatcherTyrannidae272024+139%1975
Black-headed GrosbeakCardinalidae272024+44%1974
American RobinTurdidae262024+83%1974
California Scrub-JayCorvidae252024+32%1974
Spotted TowheePasserellidae252024+9%1974
California QuailOdontophoridae232024+110%1974
Mourning DoveColumbidae232024-20%1974
Western KingbirdTyrannidae232024+12%1974
Western TanagerCardinalidae232024+136%1974
American CrowCorvidae222024-52%1974
Band-tailed PigeonColumbidae192024+333%1974
Oak TitmouseParidae152024+53%1974
Orange-crowned WarblerParulidae142024+74%1976
WrentitSylviidae122024-31%1974
Yellow WarblerParulidae112021+260%1976
Rock PigeonColumbidae112024-45%1975
California TowheePasserellidae112024+113%1975
House SparrowPasseridae102024-36%1974
Northern MockingbirdMimidae102024+92%1975
Black-throated Gray WarblerParulidae102024+320%1982
Brown-headed CowbirdIcteridae92024+30%1974
Western Wood-PeweeTyrannidae72024-57%1974
Cassin's VireoVireonidae72024+50%1976
Red-breasted NuthatchSittidae72024+367%1979
Canyon WrenTroglodytidae62023+60%1975
Chipping SparrowPasserellidae62021+125%1976
Lazuli BuntingCardinalidae62023+167%1998
Turkey VultureCathartidae52024+209%1976
Nuttall's WoodpeckerPicidae52024+83%1974
Yellow-billed MagpieCorvidae52024+7%1974
Bullock's OrioleIcteridae52024-34%1974
Purple FinchFringillidae52024+100%1974
Mountain ChickadeeParidae52024+20%1974
Brewer's BlackbirdIcteridae42024-91%1974

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