BirdAnalyst
BBS Route · California · BCR 5

Hay Fork Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 97 species recorded across 13 survey years, still active.

97Species 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 →
13Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2001–2017Span
3Observers

Bird Species Found on California Hay Fork

Top 40 of 97 species by most recent count. Each links to its species trend.

Species recorded on the Hay Fork 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
Western TanagerCardinalidae602017+82%2003
Spotted TowheePasserellidae392017-26%2003
American RobinTurdidae312017+48%2003
Black-throated Gray WarblerParulidae252017+200%2003
Black-headed GrosbeakCardinalidae232017-37%2003
Steller's JayCorvidae202017+50%2003
Yellow WarblerParulidae202017+192%2005
Orange-crowned WarblerParulidae172017+91%2003
Acorn WoodpeckerPicidae162017+48%2003
Nashville WarblerParulidae162017+160%2005
Western Wood-PeweeTyrannidae152017+9%2003
Lesser GoldfinchFringillidae152017+217%2005
Pine SiskinFringillidae152008+67%2004
Red-winged BlackbirdIcteridae142017+67%2003
Mountain ChickadeeParidae142017+573%2004
European StarlingSturnidae122017+4%2003
Yellow-breasted ChatIcteriidae122016+27%2003
Common RavenCorvidae112017+208%2003
Brewer's BlackbirdIcteridae112017+340%2003
Mourning DoveColumbidae102017+90%2004
Cassin's VireoVireonidae102017+450%2005
Warbling VireoVireonidae102013+900%2005
WrentitSylviidae102010+900%2008
Blue-gray GnatcatcherPolioptilidae92017+800%2009
Mountain QuailOdontophoridae82017-56%2003
Olive-sided FlycatcherTyrannidae82017+186%2003
Bewick's WrenTroglodytidae82010+9%2003
Bullock's OrioleIcteridae72017+57%2003
Song SparrowPasserellidae72017+257%2003
Red-breasted NuthatchSittidae72017+27%2003
Ruby-crowned KingletRegulidae72017-31%2013
California Scrub-JayCorvidae62017+67%2003
White-breasted NuthatchSittidae62017+67%2003
Wilson's WarblerParulidae62017+18%2005
California QuailOdontophoridae52017-25%2003
House FinchFringillidae52009+200%2003
Lazuli BuntingCardinalidae52010+400%2002
Northern Rough-winged SwallowHirundinidae52017+67%2016
Hermit WarblerParulidae42017-64%2003
Northern House WrenTroglodytidae42017+23%2003

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