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BBS Route · Alaska · BCR 4

Maclaren Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 71 species recorded across 35 survey years, still active.

71Species 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 →
35Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1982–2025Span
6Observers

Bird Species Found on Alaska Maclaren

Top 40 of 71 species by most recent count. Each links to its species trend.

Species recorded on the Maclaren 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
White-crowned SparrowPasserellidae942025+55%1986
Arctic WarblerPhylloscopidae732025+16%1986
American Tree SparrowPasserellidae602025-47%1986
Wilson's WarblerParulidae412025-29%1986
Savannah SparrowPasserellidae322025-39%1986
Gray-cheeked ThrushTurdidae272025-45%1986
Wilson's SnipeScolopacidae102025-68%1986
Cliff SwallowHirundinidae102025-92%1986
Blackpoll WarblerParulidae92025-10%1986
American WigeonAnatidae82022+57%1987
Yellow WarblerParulidae82025+625%1986
Lesser ScaupAnatidae82024+100%1996
Bank SwallowHirundinidae72025-53%1986
Fox SparrowPasserellidae52025-68%1986
Ring-necked DuckAnatidae52016+400%1997
Short-billed GullLaridae42025+56%1986
Semipalmated PloverCharadriidae42025-25%1986
American RobinTurdidae42025-33%1986
Surf ScoterAnatidae42014+300%1991
Northern PintailAnatidae32022-36%1992
Common RavenCorvidae32022+60%1987
Long-tailed DuckAnatidae32019-44%1992
Arctic TernLaridae22024+14%1986
MallardAnatidae22021+50%1992
Red-necked PhalaropeScolopacidae22024-50%1996
Lesser YellowlegsScolopacidae22024-20%1986
American PipitMotacillidae22017-40%1987
Green-winged TealAnatidae22025-14%1991
Trumpeter SwanAnatidae22025+40%1992
Short-eared OwlStrigidae22005+100%1986
Black-billed MagpieCorvidae21986n/an/a
Orange-crowned WarblerParulidae22025+120%1995
Greater ScaupAnatidae22024+19%1997
Tundra SwanAnatidae22021+157%2000
Golden-crowned SparrowPasserellidae22025+100%2006
KilldeerCharadriidae21996n/an/a
Northern Hawk OwlStrigidae21997+100%1996
MerlinFalconidae22001n/an/a
Black ScoterAnatidae22011n/an/a
Red-throated LoonGaviidae12025+0%1991

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