BirdAnalyst
BBS Route · California · BCR 9

Crowder Flat Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 111 species recorded across 16 survey years, still active.

111Species 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 →
16Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2002–2019Span
2Observers

Bird Species Found on California Crowder Flat

Top 40 of 111 species by most recent count. Each links to its species trend.

Species recorded on the Crowder Flat 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
Canada GooseAnatidae1222019-24%2005
Gray FlycatcherTyrannidae422019+93%2005
Mountain ChickadeeParidae312019+14%2005
American RobinTurdidae312019+28%2005
Brown-headed CowbirdIcteridae212019+117%2005
Chipping SparrowPasserellidae192019-42%2005
Northern House WrenTroglodytidae192019+319%2005
Mountain BluebirdTurdidae162019-3%2005
Vesper SparrowPasserellidae152019+7%2005
Western MeadowlarkIcteridae152019+100%2006
Cassin's FinchFringillidae142019+57%2005
Brewer's BlackbirdIcteridae122019-16%2005
Pied-billed GrebePodicipedidae122018+113%2007
Fox SparrowPasserellidae122018+450%2010
Western Wood-PeweeTyrannidae112019+23%2005
Red-winged BlackbirdIcteridae112019-67%2005
White-breasted NuthatchSittidae112019+94%2006
Steller's JayCorvidae102019+38%2005
Wilson's PhalaropeScolopacidae102007+100%2003
Brown CreeperCerthiidae92019-27%2005
RedheadAnatidae82002n/an/a
Turkey VultureCathartidae82017+90%2005
Purple FinchFringillidae82002n/an/a
Red CrossbillFringillidae82019-42%2006
Lesser ScaupAnatidae82019n/an/a
American White PelicanPelecanidae72019-42%2005
Cinnamon TealAnatidae72018+43%2005
American CootRallidae72019+31%2005
Horned LarkAlaudidae72019-11%2005
Red-breasted NuthatchSittidae72019-33%2005
Townsend's SolitaireTurdidae72019-37%2005
Hairy WoodpeckerPicidae72019+500%2006
Ring-billed GullLaridae62019-8%2005
MallardAnatidae62019+208%2005
Red-breasted SapsuckerPicidae62019+12%2005
KilldeerCharadriidae42019-13%2005
Common NighthawkCaprimulgidae42019-85%2005
European StarlingSturnidae42005+33%2002
Western TanagerCardinalidae42019-83%2005
Pygmy NuthatchSittidae42019+123%2014

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