BirdAnalyst
BBS Route · California · BCR 32

Riovista Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 83 species recorded across 44 survey years, still active.

83Species 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 →
1968–2025Span
9Observers

Bird Species Found on California Riovista

Top 40 of 83 species by most recent count. Each links to its species trend.

Species recorded on the Riovista 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
Tricolored BlackbirdIcteridae3262024-26%2012
Red-winged BlackbirdIcteridae1562025-8%1970
Western MeadowlarkIcteridae1362025-51%1970
Violet-green SwallowHirundinidae57202223×2001
House FinchFringillidae532025-41%1970
European StarlingSturnidae382025+111%1970
Eurasian Collared-DoveColumbidae242025+95%2015
Mourning DoveColumbidae232025-26%1970
Barn SwallowHirundinidae212025+0%1970
Northern MockingbirdMimidae192025+200%1970
American White PelicanPelecanidae192025-62%1996
Snowy EgretArdeidae192007+214%1999
Canada GooseAnatidae192023+44%2005
American CrowCorvidae122025-24%1970
Loggerhead ShrikeLaniidae112025-72%1970
Western KingbirdTyrannidae102025+55%1970
Turkey VultureCathartidae92024+73%1974
Brewer's BlackbirdIcteridae82025-69%1970
Brown-headed CowbirdIcteridae62025+31%1982
California Scrub-JayCorvidae62025+200%1971
KilldeerCharadriidae52025-27%1970
Long-billed CurlewScolopacidae51971n/an/a
Black-necked StiltRecurvirostridae51972n/an/a
Rock PigeonColumbidae52025-61%1975
Red-tailed HawkAccipitridae32025+0%1971
Horned LarkAlaudidae32024-19%1970
Cliff SwallowHirundinidae32023-78%1970
House SparrowPasseridae32025-90%1970
American WigeonAnatidae31976n/an/a
American RobinTurdidae32025+75%2008
Grasshopper SparrowPasserellidae32014n/an/a
Ring-billed GullLaridae32017n/an/a
Northern HarrierAccipitridae22025-25%1970
Burrowing OwlStrigidae22018-86%1970
MallardAnatidae22014-70%1993
Tree SwallowHirundinidae22023+217%1972
Black PhoebeTyrannidae22025+100%1992
Double-crested CormorantPhalacrocoracidae22018-33%1999
Great EgretArdeidae22022-17%1992
Ash-throated FlycatcherTyrannidae22017+100%1975

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