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BBS Route · Alaska · BCR 4

Cantwell Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 78 species recorded across 26 survey years, still active.

78Species 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 →
26Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1982–2025Span
7Observers

Bird Species Found on Alaska Cantwell

Top 40 of 78 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 SparrowPasserellidae892025+45%1987
American Tree SparrowPasserellidae222021-68%1987
Gray-cheeked ThrushTurdidae222025-53%1987
Blackpoll WarblerParulidae142025+21%1987
Fox SparrowPasserellidae132025-36%1987
White-winged CrossbillFringillidae132025+74%1999
Canada JayCorvidae112025+100%1987
Wilson's WarblerParulidae102025-59%1987
Cliff SwallowHirundinidae102015+233%2012
American RobinTurdidae92025-66%1987
Arctic WarblerPhylloscopidae82025-60%1987
Lesser YellowlegsScolopacidae72025-58%1987
Lincoln's SparrowPasserellidae62025+80%1998
Greater ScaupAnatidae62013+0%2005
Northern WaterthrushParulidae52025-61%1987
Ruby-crowned KingletRegulidae52025-38%1987
Wilson's SnipeScolopacidae42025-85%1987
Common RavenCorvidae42025+13%1987
Varied ThrushTurdidae42021+3%1987
Orange-crowned WarblerParulidae42025+119%1994
Bohemian WaxwingBombycillidae32019+14%2004
White-winged ScoterAnatidae32010+25%2005
American Three-toed WoodpeckerPicidae32025n/an/a
Lesser ScaupAnatidae22010+18%1987
Red-necked PhalaropeScolopacidae22001+14%1986
Greater YellowlegsScolopacidae22025+25%1998
Solitary SandpiperScolopacidae22021+0%2004
Savannah SparrowPasserellidae22025-22%1987
Trumpeter SwanAnatidae22015+29%1999
Swainson's ThrushTurdidae22025-22%1994
Boreal ChickadeeParidae22025+50%2000
Northern HarrierAccipitridae21998n/an/a
Least SandpiperScolopacidae22013+0%2002
Canada GooseAnatidae22011+0%2003
Herring GullLaridae11982n/an/a
Short-billed GullLaridae12025-70%1987
MallardAnatidae12017-56%2002
Northern Hawk OwlStrigidae12000+0%1982
Olive-sided FlycatcherTyrannidae12018-30%1987
Black-billed MagpieCorvidae12015-20%1987

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.