BirdAnalyst
BBS Route · California · BCR 15

Chaos Crater Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 71 species recorded across 23 survey years, still active.

71Species 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 →
23Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1990–2019Span
3Observers

Bird Species Found on California Chaos Crater

Top 40 of 71 species by most recent count. Each links to its species trend.

Species recorded on the Chaos Crater 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 TanagerCardinalidae282019+680%1993
Western Wood-PeweeTyrannidae72019-59%1993
Red-breasted NuthatchSittidae72019-85%1993
Canada GooseAnatidae62014-38%2007
Steller's JayCorvidae52019-49%1993
Fox SparrowPasserellidae52019-61%1993
Warbling VireoVireonidae52019+89%1993
American RobinTurdidae42019-87%1993
Cassin's VireoVireonidae42019+0%1997
Common NighthawkCaprimulgidae32018+75%1996
Olive-sided FlycatcherTyrannidae32019-82%1993
Dusky FlycatcherTyrannidae32019-38%1993
Cassin's FinchFringillidae32019-24%1993
Golden-crowned KingletRegulidae32014+20%1993
American CootRallidae31993n/an/a
White-headed WoodpeckerPicidae32019+100%1996
Brewer's BlackbirdIcteridae32012+60%2001
Lincoln's SparrowPasserellidae32019+67%2001
Townsend's SolitaireTurdidae32019-31%2001
Pygmy NuthatchSittidae32001n/an/a
Anna's HummingbirdTrochilidae21996+100%1990
Hammond's FlycatcherTyrannidae22019-91%1993
Clark's NutcrackerCorvidae22007-58%1993
Evening GrosbeakFringillidae22018+467%1994
Orange-crowned WarblerParulidae22003+50%1991
Mountain ChickadeeParidae22019-86%1993
Hermit ThrushTurdidae22019-82%1993
Tree SwallowHirundinidae22019+50%1997
Hermit WarblerParulidae22019-50%1994
Red CrossbillFringillidae22007+75%2000
Gray FlycatcherTyrannidae21994n/an/a
Common RavenCorvidae22018-13%2000
Band-tailed PigeonColumbidae22019+125%2004
Spotted SandpiperScolopacidae22012+50%2004
American GoshawkAccipitridae12000+0%1990
Western Screech-OwlStrigidae11990n/an/a
Hairy WoodpeckerPicidae12018-75%1993
Black-headed GrosbeakCardinalidae12013-33%1994
Yellow WarblerParulidae12018-73%1993
Brown CreeperCerthiidae12016-81%1993

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