BirdAnalyst
BBS Route · Alaska · BCR 4

Tonsina Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 45 species recorded across 5 survey years, still active.

45Species 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 →
5Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2014–2021Span
3Observers

Bird Species Found on Alaska Tonsina

Top 40 of 45 species by most recent count. Each links to its species trend.

Species recorded on the Tonsina 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
Swainson's ThrushTurdidae632021-20%2016
American RobinTurdidae612021+68%2016
White-winged ScoterAnatidae222018n/an/a
White-winged CrossbillFringillidae20202120×2016
Alder FlycatcherTyrannidae142021+100%2014
Orange-crowned WarblerParulidae102021+233%2016
White-crowned SparrowPasserellidae92021+9%2016
Herring GullLaridae62016+100%2014
Olive-sided FlycatcherTyrannidae52021+25%2014
Canada JayCorvidae52021-33%2016
Varied ThrushTurdidae52021-46%2016
Savannah SparrowPasserellidae42021-25%2016
Yellow WarblerParulidae42021-50%2014
Wilson's WarblerParulidae42021+0%2014
Ruby-crowned KingletRegulidae42021-85%2014
Short-billed GullLaridae32017-40%2014
Bohemian WaxwingBombycillidae32021+50%2016
Hermit ThrushTurdidae32021+50%2016
Common LoonGaviidae32018n/an/a
Cliff SwallowHirundinidae32018n/an/a
Tree SwallowHirundinidae32021n/an/a
Trumpeter SwanAnatidae22021+100%2014
Wilson's SnipeScolopacidae22021+100%2014
Pine GrosbeakFringillidae22018-33%2014
Violet-green SwallowHirundinidae22021+175%2016
Blackpoll WarblerParulidae22021-33%2014
Boreal ChickadeeParidae22021+100%2014
Barrow's GoldeneyeAnatidae12014n/an/a
BuffleheadAnatidae12014n/an/a
Lesser YellowlegsScolopacidae12021-67%2014
Bald EagleAccipitridae12017+0%2014
Great Horned OwlStrigidae12017+0%2014
Hairy WoodpeckerPicidae12017+0%2014
Common RavenCorvidae12021-75%2016
Fox SparrowPasserellidae12021-80%2016
Black-capped ChickadeeParidae12021-50%2014
Red-necked GrebePodicipedidae12016n/an/a
Belted KingfisherAlcedinidae12021+0%2016
Lincoln's SparrowPasserellidae12021-47%2017
Upland SandpiperScolopacidae12017n/an/a

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