BirdAnalyst
BBS Route · Arizona · BCR 34

Williams Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 86 species recorded across 13 survey years, still active.

86Species 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 →
1993–2019Span
7Observers

Bird Species Found on Arizona Williams

Top 40 of 86 species by most recent count. Each links to its species trend.

Species recorded on the Williams 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
Pygmy NuthatchSittidae302019+221%2001
Violet-green SwallowHirundinidae202019+148%2001
Chipping SparrowPasserellidae182019-56%2001
White-breasted NuthatchSittidae182019+100%2001
Mountain ChickadeeParidae182019+10%2001
American RobinTurdidae172019-60%2001
Western TanagerCardinalidae132019+16%2001
Western BluebirdTurdidae122019-24%2001
Western Wood-PeweeTyrannidae112019-18%2001
Canada GooseAnatidae112017n/an/a
Steller's JayCorvidae102019-33%2001
Plumbeous VireoVireonidae102019+12%2001
Common RavenCorvidae82019+2%2001
Brewer's BlackbirdIcteridae82019-41%2006
Lesser GoldfinchFringillidae82019-15%2009
Brown-headed CowbirdIcteridae72018-68%2006
House FinchFringillidae72019+118%2001
Pinyon JayCorvidae62017-53%2001
Spotted TowheePasserellidae62019+83%2007
European StarlingSturnidae52013-32%2001
Canyon TowheePasserellidae52001+400%1993
Black-headed GrosbeakCardinalidae52019-18%2006
Tree SwallowHirundinidae52016+22%2006
KilldeerCharadriidae42011+300%1999
Yellow-headed BlackbirdIcteridae42001n/an/a
Vesper SparrowPasserellidae42019-57%2011
Wild TurkeyPhasianidae42011n/an/a
Hairy WoodpeckerPicidae32019-13%2006
Barn SwallowHirundinidae32019+63%2006
Hermit ThrushTurdidae32019+9%2006
MallardAnatidae32006-77%2001
Turkey VultureCathartidae32019-10%2007
American KestrelFalconidae32018+200%2001
Dusky FlycatcherTyrannidae32006-40%2001
Clark's NutcrackerCorvidae32001n/an/a
Grace's WarblerParulidae32018-63%2007
Juniper TitmouseParidae32019-44%2011
Mountain BluebirdTurdidae32019+50%2001
Black-throated Gray WarblerParulidae32019-55%2009
Ash-throated FlycatcherTyrannidae22019+17%2001

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