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BBS Route · Alaska · BCR 5

Thompson Pas Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 58 species recorded across 25 survey years, still active.

58Species 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 →
1983–2024Span
2Observers

Bird Species Found on Alaska Thompson Pas

Top 40 of 58 species by most recent count. Each links to its species trend.

Species recorded on the Thompson Pas 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
Fox SparrowPasserellidae752024+2%2001
Hermit ThrushTurdidae692024-1%2001
Wilson's WarblerParulidae672024-2%2001
Golden-crowned SparrowPasserellidae622024+13%2001
Orange-crowned WarblerParulidae522024-48%2001
Yellow WarblerParulidae492024-37%2001
Northern WaterthrushParulidae152024+250%2003
Gray-cheeked ThrushTurdidae142024+26%2001
Swainson's ThrushTurdidae132024+273%2001
American RobinTurdidae122024+56%2001
Alder FlycatcherTyrannidae112024+19%2001
Savannah SparrowPasserellidae102024+81%2001
Violet-green SwallowHirundinidae92024+313%2001
Wilson's SnipeScolopacidae82024+3%2001
Varied ThrushTurdidae82024-35%2001
Lincoln's SparrowPasserellidae62024+8%2001
American PipitMotacillidae61983n/an/a
White-crowned SparrowPasserellidae52024-28%2002
Pine SiskinFringillidae32024+100%2002
Ruby-crowned KingletRegulidae32024+89%2001
Black-billed MagpieCorvidae32024-54%2002
Wandering TattlerScolopacidae32024+60%2006
Pacific LoonGaviidae21983n/an/a
Blackpoll WarblerParulidae22024-76%2001
Bald EagleAccipitridae22024+0%2003
Golden-crowned KingletRegulidae22019+33%2006
Glaucous-winged GullLaridae22002n/an/a
Red-breasted MerganserAnatidae22002n/an/a
Common GoldeneyeAnatidae22014+100%2002
Common RavenCorvidae22022+0%2014
Boreal ChickadeeParidae22022+0%2004
Black-capped ChickadeeParidae22024+50%2005
Red-breasted NuthatchSittidae22016+0%2007
Chestnut-backed ChickadeeParidae22022+0%2016
Herring GullLaridae22010n/an/a
Trumpeter SwanAnatidae22018+100%2015
Short-billed GullLaridae12023-68%2001
Spotted SandpiperScolopacidae12022+0%2009
Semipalmated PloverCharadriidae12006+0%1983
Olive-sided FlycatcherTyrannidae12019+0%2009

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