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Species · Wyoming · BBS 2025 Release · 1966–2024

Hammond's Flycatcher Population Trend in Wyoming

All statesAerial insectivores

Hammond's Flycatcher in Wyoming has surged: up 637% on the route-weighted index since 1984.

+637%Since 1984TrendPercent 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 →
22Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
42YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Hammond's Flycatcher Trends in WyomingNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Hammond's Flycatcher has surged in Wyoming: up 637% on the route-weighted index since 1984.

Hammond's Flycatcher Population Forecast in Wyoming

If the recent trend holds, Hammond's Flycatcher in Wyoming is projected to fall about 37% by 2029 — from 0.65 in 2024 to a central estimate of 0.41 (95% range 0.19–0.64). A 5-year backtest shows a typical error of ±46%, with 80% of held-out values landing inside the 95% band.

-37%Change by 2029TrendPercent 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 →
0.41Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.19–0.6495% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±46%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Hammond's Flycatcher in Wyoming is projected to fall about 37% by 2029 — from 0.65 in 2024 to a central estimate of 0.41 (95% range 0.19–0.64). A 5-year backtest shows a typical error of ±46%, with 80% of held-out values landing inside the 95% band.19812029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20250.380.160.61
20260.390.160.62
20270.400.170.62
20280.410.180.63
20290.410.190.64

Hammond's Flycatcher Survey Routes in Wyoming

Routes recording Hammond's Flycatcher in Wyoming.
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 →
Alpine3020241990
Hunter Peak1420241983
Ne Entrance520211989
Soda Lake520241994
Buckskin Mtn520191992
Wilson320241981
Colter Bay 2320232023
Big Sandy319901990
Yellowstone220222000
Mammoth220241983
Crazy Woman220242004
Fiddler Lk220232022
Sundance120102005
Dubois120182018
Fontenelle120112011
Moose120241999
Bald Mtn119991992
Horse Creek120222022
Warbonnet120102010
Fletcher Pk120242012
Fox Park119971997
Ryan Park120232022

Hammond's Flycatcher Population Trend in Other States

alaskaarizonacaliforniacoloradoidahomontananew-mexicooregonutahwashington

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.