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

Wetland Birds In Wyoming

All statesWyoming

20 species in this guild. As a group they are -60%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 →

Wetland birds as a group have fallen sharply in Wyoming, down 60% since 1970.

Wetland Birds In Wyoming Population Forecast

If the recent trend holds, Wetland birds in Wyoming is projected to fall about 59% by 2030 — from 2.6 in 2025 to a central estimate of 1.1 (95% range 0.00–3.8). A 5-year backtest shows a typical error of ±59.7%, with 100% of held-out values landing inside the 95% band.

-59%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 →
1.1Projected 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 →
0.00–3.895% 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 →
±59.7%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, Wetland birds in Wyoming is projected to fall about 59% by 2030 — from 2.6 in 2025 to a central estimate of 1.1 (95% range 0.00–3.8). A 5-year backtest shows a typical error of ±59.7%, 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 →
20261.30.004.0
20271.20.003.9
20281.20.003.9
20291.10.003.9
20301.10.003.8

Member Species In Wyoming

Wetland birds species in Wyoming.
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 →
Franklin's GullLaridae-95%
Black-crowned Night HeronArdeidae-93%
American BitternArdeidae-90%
Pied-billed GrebePodicipedidae-89%
Forster's TernLaridae-64%
Belted KingfisherAlcedinidae-46%
American DipperCinclidae-45%
Common LoonGaviidae-43%
California GullLaridae-41%
Double-crested CormorantPhalacrocoracidae-20%
Red-winged BlackbirdIcteridae-4%
Yellow-headed BlackbirdIcteridae+22%
American CootRallidae+30%
Western GrebePodicipedidae+35%
Great Blue HeronArdeidae+57%
SoraRallidae+65%
Eared GrebePodicipedidae+390%
American White PelicanPelecanidae+657%
Ring-billed GullLaridae+780%
Sandhill CraneGruidae+992%

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