BirdAnalyst
Guild · Colorado · BBS 2026 Release · 1966–2025

Game Birds In Colorado

All statesColorado

10 species in this guild. As a group they are -97%Guild trendA mean-index aggregate across the species in this group — the structural direction of the guild, with individual-species noise smoothed out.Full methodology → since 1970.

Guild SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

guild collapsecomputed 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 →

Game birds as a group have collapsed in Colorado, down 97% since 1970.

Game Birds In Colorado Population Forecast

If the recent trend holds, Game birds in Colorado is projected to fall about 100% by 2030 — from 0.24 in 2025 to a central estimate of 0.00 (95% range 0.00–3.0). A 5-year backtest shows a typical error of ±641.4%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2030TrendPercent 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 →
0.00Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–3.095% 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 →
±641.4%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, Game birds in Colorado is projected to fall about 100% by 2030 — from 0.24 in 2025 to a central estimate of 0.00 (95% range 0.00–3.0). A 5-year backtest shows a typical error of ±641.4%, with 100% of held-out values landing inside the 95% band.19682030
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 →
20260.000.003.0
20270.000.003.0
20280.000.003.0
20290.000.003.0
20300.000.003.0

Member Species In Colorado

Game birds species in Colorado.
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 →
Ring-necked PheasantPhasianidae-96%
Greater Sage-GrousePhasianidae-89%
Scaled QuailOdontophoridae-67%
ChukarPhasianidae-66%
Dusky GrousePhasianidae-61%
Northern BobwhiteOdontophoridae-50%
Gunnison Sage-GrousePhasianidae-34%
Greater Prairie-ChickenPhasianidae+81%
Gambel's QuailOdontophoridae+167%
Wild TurkeyPhasianidae+655%

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.