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Species · Wyoming · BBS 2025 Release · 1966–2024

Brewer's Blackbird Population Trend in Wyoming

All statesGeneralists

Brewer's Blackbird in Wyoming has fallen sharply: down 52% on the route-weighted index since 1970.

-52%Since 1970TrendPercent 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 →
134Routes 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 →
56YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Brewer's Blackbird 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 declinecomputed 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 →

Brewer's Blackbird has fallen sharply in Wyoming: down 52% on the route-weighted index since 1970.

Brewer's Blackbird Population Forecast in Wyoming

If the recent trend holds, Brewer's Blackbird in Wyoming is projected to rise about 16% by 2029 — from 11 in 2024 to a central estimate of 13 (95% range 1.3–24). A 5-year backtest shows a typical error of ±17.3%, with 100% of held-out values landing inside the 95% band.

+16%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 →
13Projected 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 →
1.3–2495% 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 →
±17.3%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, Brewer's Blackbird in Wyoming is projected to rise about 16% by 2029 — from 11 in 2024 to a central estimate of 13 (95% range 1.3–24). A 5-year backtest shows a typical error of ±17.3%, with 100% of held-out values landing inside the 95% band.19682029
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 →
2025142.125
2026131.925
2027131.725
2028131.524
2029131.324

Brewer's Blackbird Survey Routes in Wyoming

Routes recording Brewer's Blackbird 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 →
Dwyer22620191992
Boulder9820241982
Bill6720181974
Lusk5520241984
Meeteetse5120241991
Daniel5119881980
Walcott5120241982
Buford5020241974
Upton4920241987
Meadowdale4820191983
Harmony4620231980
Green River3819841977
Arminto3420241982
Patrick Draw3319801973
Bucknum3220241993
Cumberland3120241977
Fletcher Pk3120241979
Diamondville3119821977
Shawnee2820241988
Mammoth2720241982
Fontenelle2520241982
Seely2320001990
Natrona2219921968
Gvnt Valley2220241992
Rozet2120231991

Brewer's Blackbird Population Trend in Other States

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