BirdAnalyst
BBS Route · Alaska · BCR 4

Circle Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 72 species recorded across 32 survey years, still active.

72Species 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 →
32Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1986–2024Span
6Observers

Bird Species Found on Alaska Circle

Top 40 of 72 species by most recent count. Each links to its species trend.

Species recorded on the Circle 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
Alder FlycatcherTyrannidae762024+5%1988
Swainson's ThrushTurdidae662024-56%1988
White-crowned SparrowPasserellidae462024+317%1988
Bank SwallowHirundinidae312024+557%1997
Wilson's WarblerParulidae262024+444%1988
White-winged CrossbillFringillidae202024-68%1993
Lincoln's SparrowPasserellidae192024+225%1988
Orange-crowned WarblerParulidae122024-41%1988
Western Wood-PeweeTyrannidae122024+5%1992
Cliff SwallowHirundinidae102019+38%2005
American Tree SparrowPasserellidae102018+380%1998
Yellow WarblerParulidae92024+200%1988
Greater White-fronted GooseAnatidae81996+100%1986
Sandhill CraneGruidae82024-8%1993
Olive-sided FlycatcherTyrannidae82024-17%1988
Canada JayCorvidae82024-49%1988
American RobinTurdidae82024+8%1988
Violet-green SwallowHirundinidae82011+450%1998
Fox SparrowPasserellidae72024+11%1994
Northern WaterthrushParulidae72024-14%1993
Blackpoll WarblerParulidae72018+300%2006
Greater ScaupAnatidae61995n/an/a
Trumpeter SwanAnatidae42024+300%2017
Varied ThrushTurdidae32024-80%1988
Hammond's FlycatcherTyrannidae32024+33%1993
Spotted SandpiperScolopacidae32024+67%1997
Red-throated LoonGaviidae32024+100%2021
Savannah SparrowPasserellidae32019+33%2011
Canada GooseAnatidae21992-67%1986
Wilson's SnipeScolopacidae22024-89%1988
Lesser YellowlegsScolopacidae22024+33%1994
BuffleheadAnatidae22023-40%1997
Red-tailed HawkAccipitridae21987n/an/a
Rusty BlackbirdIcteridae22017-38%2005
Pine GrosbeakFringillidae22002+0%1993
American KestrelFalconidae22012+100%1988
MallardAnatidae22000+0%1992
Black-capped ChickadeeParidae22022+67%2001
Chipping SparrowPasserellidae22022-44%2010
Northern Hawk OwlStrigidae22021-38%2009

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