BirdAnalyst
Species · Arizona · BBS 2025 Release · 1966–2024

Least Bittern Population Trend in Arizona

All statesWetland birds

Least Bittern in Arizona has fallen sharply: down 56% on the route-weighted index since 2002.

-56%Since 2002
3Routes In State
18Years

Notable Least Bittern Trends in Arizona

No notable trend signals for Least Bittern in Arizona. See the full index history below.

Least Bittern Population Forecast in Arizona

If the recent trend holds, Least Bittern in Arizona is projected to stay roughly flat through 2028, near 0.04 (95% range 0.00–0.11). A 5-year backtest shows a typical error of ±304.3%, with 20% of held-out values landing inside the 95% band.

n/aChange by 2028
0.04Projected 2028 index
0.00–0.1195% range
±304.3%Backtest error
20002028
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20240.050.000.12
20250.040.000.12
20260.040.000.12
20270.040.000.11
20280.040.000.11

Least Bittern Survey Routes in Arizona

Routes recording Least Bittern in Arizona.
Cibola Lake320172002
Laguna120102000
Araby120232000

Least Bittern Population Trend in Other States

alabamaarkansascaliforniaconnecticutdelawarefloridageorgiaillinoisindianaiowakansaslouisianamarylandmichiganminnesotamississippimissourinebraskanevadanew-hampshirenew-jerseynew-yorknorth-carolinanorth-dakotaohiooregonsouth-carolinasouth-dakotatexasvermontvirginiawisconsin

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