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BBS Route · Alaska · BCR 4

Cantwell Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 76 species recorded across 25 survey years, still active.

76Species 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 →
25Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1982–2021Span
6Observers

Bird Species Found on Alaska Cantwell

Top 40 of 76 species by most recent count. Each links to its species trend.

Species recorded on the Cantwell 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
White-crowned SparrowPasserellidae1622021+56%1987
American Tree SparrowPasserellidae222021-68%1987
White-winged CrossbillFringillidae172019+16%1999
Blackpoll WarblerParulidae142021+47%1987
Gray-cheeked ThrushTurdidae142021-53%1987
Savannah SparrowPasserellidae112021-15%1987
Bank SwallowHirundinidae112003-86%1986
Lincoln's SparrowPasserellidae102019+90%1998
Wilson's WarblerParulidae102021-40%1987
Arctic WarblerPhylloscopidae102021-53%1987
American RobinTurdidae102021-40%1987
Cliff SwallowHirundinidae102015+233%2012
Fox SparrowPasserellidae92021-15%1987
Ruby-crowned KingletRegulidae72021-35%1987
Orange-crowned WarblerParulidae72021+181%1994
Greater ScaupAnatidae62013+0%2005
Canada JayCorvidae52021+64%1987
Lesser YellowlegsScolopacidae42021-66%1987
Varied ThrushTurdidae42021+3%1987
Northern WaterthrushParulidae32021-68%1987
Swainson's ThrushTurdidae32021+6%1994
Bohemian WaxwingBombycillidae32019+14%2004
White-winged ScoterAnatidae32010+25%2005
Short-billed GullLaridae22019-70%1987
Lesser ScaupAnatidae22010+18%1987
Red-necked PhalaropeScolopacidae22001+14%1986
Wilson's SnipeScolopacidae22021-82%1987
Greater YellowlegsScolopacidae22005+0%1998
Solitary SandpiperScolopacidae22021+0%2004
Trumpeter SwanAnatidae22015+29%1999
Boreal ChickadeeParidae22021+67%2000
Northern HarrierAccipitridae21998n/an/a
Least SandpiperScolopacidae22013+0%2002
Canada GooseAnatidae22011+0%2003
Herring GullLaridae11982n/an/a
MallardAnatidae12017-56%2002
Northern Hawk OwlStrigidae12000+0%1982
Olive-sided FlycatcherTyrannidae12018-30%1987
Black-billed MagpieCorvidae12015-20%1987
Common RavenCorvidae12021+0%1987

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