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Species · Nebraska · BBS 2025 Release · 1966–2024

White-faced Ibis Population Trend in Nebraska

All statesWetland birds

White-faced Ibis in Nebraska has edged down: down 21% on the route-weighted index since 1990.

-21%Since 1990TrendPercent 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 →
8Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
23YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable White-faced Ibis Trends in NebraskaNotable 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 White-faced Ibis in Nebraska. See the full index history below.

White-faced Ibis Population Forecast in Nebraska

If the recent trend holds, White-faced Ibis in Nebraska is projected to stay roughly flat through 2029, near 0.62 (95% range 0.00–1.4). A 5-year backtest shows a typical error of ±1740.7%, with 40% of held-out values landing inside the 95% band.

n/aChange 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 →
0.62Projected 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 →
0.00–1.495% 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 →
±1740.7%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, White-faced Ibis in Nebraska is projected to stay roughly flat through 2029, near 0.62 (95% range 0.00–1.4). A 5-year backtest shows a typical error of ±1740.7%, with 40% of held-out values landing inside the 95% band.19882029
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 →
20250.560.001.3
20260.580.001.3
20270.590.001.3
20280.600.001.4
20290.620.001.4

White-faced Ibis Survey Routes in Nebraska

Routes recording White-faced Ibis in Nebraska.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Crescent Lk4020171988
Brownlee1420182007
Table1320082008
Kennedy720162014
Swan Lake320212021
Murray Lake120032003
Bassett120192019
Wheeler Co120241995

White-faced Ibis Population Trend in Other States

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