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Species · Kansas · BBS 2025 Release · 1966–2024

White-faced Ibis Population Trend in Kansas

All statesWetland birds

White-faced Ibis in Kansas has surged: up 342% on the route-weighted index since 1976.

+342%Since 1976TrendPercent 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 →
3Routes 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 →
19YearsYears 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 KansasNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed 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 →

White-faced Ibis has surged in Kansas: up 341% on the route-weighted index since 1976.

White-faced Ibis Population Forecast in Kansas

If the recent trend holds, White-faced Ibis in Kansas is projected to fall about 56% by 2024 — from 1.2 in 2019 to a central estimate of 0.54 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±832.2%, with 100% of held-out values landing inside the 95% band.

-56%Change by 2024TrendPercent 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 →
0.54Projected 2024 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 →
±832.2%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, White-faced Ibis in Kansas is projected to fall about 56% by 2024 — from 1.2 in 2019 to a central estimate of 0.54 (95% range 0.00–1.6). A 5-year backtest shows a typical error of ±832.2%, with 100% of held-out values landing inside the 95% band.19702024
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 →
20200.520.001.5
20210.530.001.6
20220.530.001.6
20230.540.001.6
20240.540.001.6

White-faced Ibis Survey Routes in Kansas

Routes recording White-faced Ibis in Kansas.
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 →
Albert5820191970
Plymell1120012001
Coats219961996

White-faced Ibis Population Trend in Other States

arizonacaliforniacoloradoidaholouisianamontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotatexasutahwyoming

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