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

Wetland Birds In Alabama

All statesAlabama

33 species in this guild. As a group they are -40%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 1968.

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 →

No notable trend signals for wetland birds in Alabama. See the full index history below.

Wetland Birds In Alabama Population Forecast

If the recent trend holds, Wetland birds in Alabama is projected to fall about 65% by 2030 — from 1.9 in 2025 to a central estimate of 0.69 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±46.6%, with 60% of held-out values landing inside the 95% band.

-65%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 →
0.69Projected 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 →
0.00–1.695% 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 →
±46.6%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 Alabama is projected to fall about 65% by 2030 — from 1.9 in 2025 to a central estimate of 0.69 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±46.6%, with 60% of held-out values landing inside the 95% band.19662030
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 →
20260.830.001.8
20270.800.001.7
20280.760.001.7
20290.720.001.7
20300.690.001.6

Member Species In Alabama

Wetland birds species in Alabama.
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 →
Gull-billed TernLaridae-94%
Least TernLaridae-92%
Red-winged BlackbirdIcteridae-88%
Belted KingfisherAlcedinidae-82%
Tricolored HeronArdeidae-78%
Herring GullLaridae-76%
Black SkimmerLaridae-74%
Purple GallinuleRallidae-73%
Reddish EgretArdeidae-72%
American CootRallidae-72%
Least BitternArdeidae-72%
Clapper RailRallidae-69%
Little Blue HeronArdeidae-66%
Pied-billed GrebePodicipedidae-60%
Sandwich TernLaridae-57%
Boat-tailed GrackleIcteridae-54%
Snowy EgretArdeidae-49%
Green HeronArdeidae-45%
Ring-billed GullLaridae-40%
Forster's TernLaridae-33%
Caspian TernLaridae-25%
AnhingaAnhingidae+6%
Yellow-crowned Night HeronArdeidae+7%
Common GallinuleRallidae+99%
White IbisThreskiornithidae+182%
Western Cattle-EgretArdeidae+216%
Royal TernLaridae+262%
Black-crowned Night HeronArdeidae+276%
Great Blue HeronArdeidae+350%
Brown PelicanPelecanidae13×
Great EgretArdeidae18×
Laughing GullLaridae21×
Double-crested CormorantPhalacrocoracidae86×

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