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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 26 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 →
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 →
1983–2025Span
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
Hermit ThrushTurdidae1022025+15%2001
Fox SparrowPasserellidae612025-9%2001
Wilson's WarblerParulidae512025-8%2001
Yellow WarblerParulidae502025-32%2001
Orange-crowned WarblerParulidae452025-51%2001
Violet-green SwallowHirundinidae422025+588%2001
Golden-crowned SparrowPasserellidae342025+4%2001
Northern WaterthrushParulidae142025+325%2003
American RobinTurdidae132025+41%2001
Varied ThrushTurdidae132025-44%2001
Gray-cheeked ThrushTurdidae92025+42%2001
Swainson's ThrushTurdidae82025+213%2001
Pine SiskinFringillidae72025+100%2002
American PipitMotacillidae61983n/an/a
Wilson's SnipeScolopacidae52025+3%2001
Black-billed MagpieCorvidae52025-31%2002
Ruby-crowned KingletRegulidae42025+78%2001
Alder FlycatcherTyrannidae32025+4%2001
Savannah SparrowPasserellidae32025+42%2001
White-crowned SparrowPasserellidae32025-17%2002
Wandering TattlerScolopacidae32024+60%2006
Brown CreeperCerthiidae32025+0%2011
Pine GrosbeakFringillidae32025+200%2016
Pacific LoonGaviidae21983n/an/a
Short-billed GullLaridae22025-82%2001
Lincoln's SparrowPasserellidae22025+8%2001
Blackpoll WarblerParulidae22025-79%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
Spotted SandpiperScolopacidae12022+0%2009

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