BirdAnalyst
BBS Route · Alaska · BCR 4

Sourdough Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 83 species recorded across 27 survey years, still active.

83Species 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 →
27Years 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
6Observers

Bird Species Found on Alaska Sourdough

Top 40 of 83 species by most recent count. Each links to its species trend.

Species recorded on the Sourdough 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 ThrushTurdidae1002025+71%1990
American RobinTurdidae412025+23%1990
Ruby-crowned KingletRegulidae332025+33%1990
White-crowned SparrowPasserellidae292025-43%1990
Canada JayCorvidae242025+13%1990
Lincoln's SparrowPasserellidae212025+510%1990
Alder FlycatcherTyrannidae192024+14%1990
Harlequin DuckAnatidae141994n/an/a
Cliff SwallowHirundinidae132014-55%1993
Wilson's WarblerParulidae132025+43%1990
Savannah SparrowPasserellidae112025-18%1990
Greater YellowlegsScolopacidae102018+163%2000
Wilson's SnipeScolopacidae82025-25%1990
Lesser YellowlegsScolopacidae72025-46%1990
Canada GooseAnatidae62025-15%1990
Chipping SparrowPasserellidae52025+183%2014
Black-billed MagpieCorvidae52022+400%1998
Bonaparte's GullLaridae42001+75%1992
Tree SwallowHirundinidae42016+20%1991
Arctic TernLaridae42017+75%1991
Red-necked PhalaropeScolopacidae42000-29%1993
Ring-necked DuckAnatidae42024+40%1999
White-winged ScoterAnatidae42025n/an/a
Common RavenCorvidae32025+100%1991
Pine GrosbeakFringillidae32021+129%1991
White-winged CrossbillFringillidae32025-74%1994
Pine SiskinFringillidae32018+133%1995
Song SparrowPasserellidae32013+0%1998
Short-billed GullLaridae22024+10%1991
MallardAnatidae22023+0%1991
Western Wood-PeweeTyrannidae22024-63%1990
Orange-crowned WarblerParulidae22024+50%1990
Green-winged TealAnatidae22000+50%1990
American WigeonAnatidae22024-40%1996
Bank SwallowHirundinidae22018-60%1995
Hermit ThrushTurdidae22022-20%2008
Short-eared OwlStrigidae22017n/an/a
Blue-winged TealAnatidae22024n/an/a
Solitary SandpiperScolopacidae12009-17%1990
Olive-sided FlycatcherTyrannidae12022-87%1990

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