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BBS Route · Alaska · BCR 5

Thorne Bay 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 54 species recorded across 9 survey years, still active.

54Species 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 →
9Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2013–2025Span
5Observers

Bird Species Found on Alaska Thorne Bay 2

Top 40 of 54 species by most recent count. Each links to its species trend.

Species recorded on the Thorne Bay 2 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
Townsend's WarblerParulidae792025+149%2018
Hermit ThrushTurdidae622025+28%2018
Varied ThrushTurdidae622025+12%2017
Pacific WrenTroglodytidae562025+53%2017
Swainson's ThrushTurdidae432025+85%2017
Chestnut-backed ChickadeeParidae382025+447%2018
Golden-crowned KingletRegulidae342025+594%2017
American RobinTurdidae252025+53%2017
American CrowCorvidae192025+52%2017
Orange-crowned WarblerParulidae152025+48%2018
Steller's JayCorvidae132025+56%2021
Red-breasted SapsuckerPicidae112025+67%2017
Common RavenCorvidae102025+3%2017
Wilson's WarblerParulidae102022+400%2016
Bald EagleAccipitridae92025+171%2017
Harlequin DuckAnatidae82023n/an/a
Belted KingfisherAlcedinidae62025+120%2021
Red CrossbillFringillidae62025+650%2022
White-winged ScoterAnatidae62017n/an/a
Eurasian Collared-DoveColumbidae42024+40%2016
Black-capped ChickadeeParidae42022-46%2017
Tree SwallowHirundinidae42024+300%2023
Red-throated LoonGaviidae32025-25%2022
Pine SiskinFringillidae32024+433%2017
Song SparrowPasserellidae32025+33%2016
Downy WoodpeckerPicidae22017+100%2013
Lincoln's SparrowPasserellidae22025-57%2022
Ruby-crowned KingletRegulidae22024-33%2013
Common LoonGaviidae22025+150%2021
American Tree SparrowPasserellidae22016n/an/a
American DipperCinclidae22018+100%2016
MallardAnatidae22022-33%2017
Marbled MurreletAlcidae12024-73%2016
Common MerganserAnatidae12013n/an/a
Canada GooseAnatidae12021-50%2013
Hairy WoodpeckerPicidae12024+220%2016
Rufous HummingbirdTrochilidae12024-60%2016
Fox SparrowPasserellidae12022-67%2016
Yellow WarblerParulidae12016-50%2013
MerlinFalconidae12016n/an/a

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