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BBS Route · Wyoming · BCR 10

Mammoth Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 128 species recorded across 42 survey years, still active.

128Species 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 →
42Years 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
10Observers

Bird Species Found on Wyoming Mammoth

Top 40 of 128 species by most recent count. Each links to its species trend.

Species recorded on the Mammoth 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
American RobinTurdidae822025+20%1985
Warbling VireoVireonidae422025+22%1985
Brewer's SparrowPasserellidae412025+189%1985
Pine SiskinFringillidae332025+22%1985
Vesper SparrowPasserellidae262025+58%1985
Chipping SparrowPasserellidae262025-1%1985
Cliff SwallowHirundinidae262025-55%1985
Lesser ScaupAnatidae242025+180%1985
White-crowned SparrowPasserellidae242025+77%1985
Western TanagerCardinalidae232025+117%1985
Green-tailed TowheePasserellidae162025+68%1985
Lincoln's SparrowPasserellidae152025+15%1985
Violet-green SwallowHirundinidae142025-44%1985
Ruby-crowned KingletRegulidae142025+85%1985
Red-winged BlackbirdIcteridae132025-51%1985
Savannah SparrowPasserellidae102025-12%1985
Mountain ChickadeeParidae102025-14%1985
American CootRallidae92025-6%1985
Brewer's BlackbirdIcteridae82025+146%1985
Tree SwallowHirundinidae82025-21%1985
Common YellowthroatParulidae82025-28%1985
Song SparrowPasserellidae82025+120%1986
Common MerganserAnatidae72018+75%1982
Wilson's SnipeScolopacidae72025+39%1985
Black-billed MagpieCorvidae72025+31%1985
Common RavenCorvidae72025-55%1985
Yellow-headed BlackbirdIcteridae72025-6%1985
Western MeadowlarkIcteridae72025+40%1985
Eared GrebePodicipedidae72016+250%1999
Clark's NutcrackerCorvidae62025-74%1985
Swainson's ThrushTurdidae62025+300%2013
Hermit ThrushTurdidae62025-58%1985
American CrowCorvidae61999+500%1987
European StarlingSturnidae52025-40%1988
Brown-headed CowbirdIcteridae52025+7%1985
Northern House WrenTroglodytidae52025+86%1985
American AvocetRecurvirostridae52024+44%1992
Ring-necked DuckAnatidae42024-14%1989
MacGillivray's WarblerParulidae42025-65%1988
Red-breasted NuthatchSittidae42025-33%1985

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