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

Forest Birds In Iowa

All statesIowa

44 species in this guild. As a group they are +16%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 1969.

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 Iowa. See the full index history below.

Forest Birds In Iowa Population Forecast

If the recent trend holds, Forest birds in Iowa is projected to stay roughly flat through 2030, near 5.5 (95% range 4.7–6.2). A 5-year backtest shows a typical error of ±6.1%, with 100% of held-out values landing inside the 95% band.

+7%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 →
5.5Projected 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 →
4.7–6.295% 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 →
±6.1%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 Iowa is projected to stay roughly flat through 2030, near 5.5 (95% range 4.7–6.2). A 5-year backtest shows a typical error of ±6.1%, with 100% of held-out values landing inside the 95% band.19672030
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 →
20265.44.76.1
20275.44.76.1
20285.44.76.1
20295.44.76.2
20305.54.76.2

Member Species In Iowa

Forest birds species in Iowa.
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 →
Yellow-billed CuckooCuculidae-88%
Black-billed CuckooCuculidae-66%
Tufted TitmouseParidae-64%
American GoldfinchFringillidae-58%
Red-headed WoodpeckerPicidae-57%
Brown ThrasherMimidae-57%
Blue JayCorvidae-42%
Field SparrowPasserellidae-42%
Summer TanagerCardinalidae-38%
Black-capped ChickadeeParidae-37%
Baltimore OrioleIcteridae-25%
Common YellowthroatParulidae-24%
OvenbirdParulidae-22%
Scarlet TanagerCardinalidae-17%
Song SparrowPasserellidae+12%
Northern House WrenTroglodytidae+15%
Rose-breasted GrosbeakCardinalidae+15%
Red-eyed VireoVireonidae+32%
Downy WoodpeckerPicidae+33%
Eastern BluebirdTurdidae+34%
Hairy WoodpeckerPicidae+50%
Yellow-throated VireoVireonidae+81%
Indigo BuntingCardinalidae+85%
Northern CardinalCardinalidae+95%
Eastern TowheePasserellidae+96%
White-breasted NuthatchSittidae+115%
White-eyed VireoVireonidae+117%
Blue-gray GnatcatcherPolioptilidae+122%
Red-bellied WoodpeckerPicidae+146%
Carolina WrenTroglodytidae+149%
Orchard OrioleIcteridae+155%
Gray CatbirdMimidae+156%
American RobinTurdidae+165%
Marsh WrenTroglodytidae+193%
Bell's VireoVireonidae+200%
Warbling VireoVireonidae+209%
Yellow WarblerParulidae+229%
Yellow-breasted ChatIcteriidae+303%
Blue GrosbeakCardinalidae+359%
Ruby-throated HummingbirdTrochilidae+373%
Wood ThrushTurdidae+432%
Chipping SparrowPasserellidae+671%
Cedar WaxwingBombycillidae+687%
American RedstartParulidae16×

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