BirdAnalyst
Guild · Wisconsin · BBS 2025 Release · 1966–2024

Forest Birds In Wisconsin

All statesWisconsin

52 species in this guild. As a group they are +70%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 forest birds in Wisconsin. See the full index history below.

Forest Birds In Wisconsin Population Forecast

If the recent trend holds, Forest birds in Wisconsin is projected to stay roughly flat through 2029, near 5.1 (95% range 4.7–5.6). A 5-year backtest shows a typical error of ±4.2%, with 100% of held-out values landing inside the 95% band.

+2%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 →
5.1Projected 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 →
4.7–5.695% 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 →
±4.2%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, Forest birds in Wisconsin is projected to stay roughly flat through 2029, near 5.1 (95% range 4.7–5.6). A 5-year backtest shows a typical error of ±4.2%, with 100% of held-out values landing inside the 95% band.19662029
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 →
20255.04.65.4
20265.04.65.5
20275.14.65.5
20285.14.75.5
20295.14.75.6

Member Species In Wisconsin

Forest birds species in Wisconsin.
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 →
Red-headed WoodpeckerPicidae-78%
Ruby-crowned KingletRegulidae-65%
Swainson's ThrushTurdidae-53%
Boreal ChickadeeParidae-44%
Bell's VireoVireonidae-39%
Connecticut WarblerParulidae-37%
Palm WarblerParulidae-32%
Marsh WrenTroglodytidae-31%
Tennessee WarblerParulidae-25%
Eastern BluebirdTurdidae-20%
Warbling VireoVireonidae-16%
Cerulean WarblerParulidae+11%
VeeryTurdidae+12%
Canada WarblerParulidae+14%
Golden-winged WarblerParulidae+20%
Mourning WarblerParulidae+35%
Common YellowthroatParulidae+50%
Yellow WarblerParulidae+55%
American RobinTurdidae+58%
Wood ThrushTurdidae+75%
Northern House WrenTroglodytidae+79%
OvenbirdParulidae+83%
White-breasted NuthatchSittidae+92%
Black-throated Green WarblerParulidae+93%
Nashville WarblerParulidae+96%
Winter WrenTroglodytidae+99%
Golden-crowned KingletRegulidae+103%
Yellow-throated VireoVireonidae+103%
Hermit ThrushTurdidae+105%
Chestnut-sided WarblerParulidae+114%
Tufted TitmouseParidae+130%
Downy WoodpeckerPicidae+132%
Northern ParulaParulidae+142%
Blackburnian WarblerParulidae+168%
Brown CreeperCerthiidae+180%
Red-eyed VireoVireonidae+183%
Hairy WoodpeckerPicidae+203%
Black-capped ChickadeeParidae+223%
American RedstartParulidae+245%
Black-and-white WarblerParulidae+262%
Blue-winged WarblerParulidae+282%
Yellow-bellied SapsuckerPicidae+330%
Cape May WarblerParulidae+342%
Pileated WoodpeckerPicidae+376%
Northern WaterthrushParulidae+382%
Magnolia WarblerParulidae+400%
Black-throated Blue WarblerParulidae+502%
Blue-headed VireoVireonidae+518%
Red-bellied WoodpeckerPicidae+756%
Red-breasted NuthatchSittidae15×
Blue-gray GnatcatcherPolioptilidae15×
Pine WarblerParulidae22×

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