BirdAnalyst
BBS Route · Alaska · BCR 4

Circle Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 72 species recorded across 33 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 →
33Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1986–2025Span
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
Swainson's ThrushTurdidae782025-51%1988
Alder FlycatcherTyrannidae412025-6%1988
Yellow WarblerParulidae242025+344%1988
White-crowned SparrowPasserellidae212025+240%1988
Orange-crowned WarblerParulidae162025-43%1988
Lincoln's SparrowPasserellidae152025+194%1988
White-winged CrossbillFringillidae152025-61%1993
Wilson's SnipeScolopacidae132025-54%1988
Canada JayCorvidae112025-55%1988
Wilson's WarblerParulidae112025+422%1988
American RobinTurdidae112025+4%1988
Cliff SwallowHirundinidae102019+38%2005
American Tree SparrowPasserellidae102018+380%1998
Ruby-crowned KingletRegulidae92025-63%1988
Greater White-fronted GooseAnatidae81996+100%1986
Sandhill CraneGruidae82024-8%1993
Violet-green SwallowHirundinidae82011+450%1998
Common RavenCorvidae72025+0%1988
Northern WaterthrushParulidae72024-14%1993
Blackpoll WarblerParulidae72018+300%2006
Olive-sided FlycatcherTyrannidae62025-6%1988
Greater ScaupAnatidae61995n/an/a
Trumpeter SwanAnatidae52025+117%2021
Bank SwallowHirundinidae42025+514%1997
Fox SparrowPasserellidae42025+33%1994
Varied ThrushTurdidae32025-80%1988
Spotted SandpiperScolopacidae32024+67%1997
Savannah SparrowPasserellidae32019+33%2011
Lesser YellowlegsScolopacidae22024+33%1994
Boreal ChickadeeParidae22025-78%1988
Gray-cheeked ThrushTurdidae22025-33%1992
BuffleheadAnatidae22023-40%1997
Red-tailed HawkAccipitridae21987n/an/a
Western Wood-PeweeTyrannidae22025-5%1992
Rusty BlackbirdIcteridae22017-38%2005
Pine GrosbeakFringillidae22002+0%1993
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 2026-08-14. A route is a sample, not a census.