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BBS Route · California · BCR 5

Rio Dell Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 116 species recorded across 35 survey years, still active.

116Species 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 →
35Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2012Span
10Observers

Bird Species Found on California Rio Dell

Top 40 of 116 species by most recent count. Each links to its species trend.

Species recorded on the Rio Dell 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
Swainson's ThrushTurdidae502012+11%1974
American RobinTurdidae322012-20%1974
Song SparrowPasserellidae312012-18%1974
White-crowned SparrowPasserellidae272012-7%1974
American GoldfinchFringillidae222012+33%1974
Common RavenCorvidae182012-4%1974
House SparrowPasseridae182012+70%1977
Lazuli BuntingCardinalidae142012+7%1975
Red CrossbillFringillidae142005+500%2001
Barn SwallowHirundinidae132012-57%1974
Turkey VultureCathartidae102010+50%1975
Savannah SparrowPasserellidae102012-7%1974
Rock PigeonColumbidae102011+500%1988
Varied ThrushTurdidae92012-54%1974
Brown-headed CowbirdIcteridae82011+19%1974
Western MeadowlarkIcteridae82012-8%1974
Pine SiskinFringillidae82011-21%1974
American CrowCorvidae72012+100%1977
House FinchFringillidae72012-57%1974
Pacific WrenTroglodytidae72012-39%1974
Chestnut-backed ChickadeeParidae72012+92%1974
Cliff SwallowHirundinidae72011-38%1980
California QuailOdontophoridae62012-4%1974
Red-tailed HawkAccipitridae62012+36%1975
Tree SwallowHirundinidae62012+91%1974
BushtitAegithalidae62007+140%1980
Canada GooseAnatidae62007+50%1998
Band-tailed PigeonColumbidae52012-17%1974
Steller's JayCorvidae52012-11%1974
Brewer's BlackbirdIcteridae52012-44%1974
Lesser GoldfinchFringillidae52010-25%1974
Cedar WaxwingBombycillidae52011-22%1980
Warbling VireoVireonidae52010+0%1979
Yellow-breasted ChatIcteriidae52008+300%1984
Grasshopper SparrowPasserellidae52007-56%1992
Purple FinchFringillidae42012-85%1980
Chipping SparrowPasserellidae42012-63%1974
Purple MartinHirundinidae42011-44%1974
MacGillivray's WarblerParulidae42002-29%1979
Wilson's WarblerParulidae42012-23%1974

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