BirdAnalyst
Species · BCR 33 · BBS 2025 Release · 1966–2024

Least Bittern In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsWetland birds

Least Bittern in Sonoran and Mojave Deserts has declined: down 41% on the route-weighted index since 2001.

-41%Since 2001
6Routes In Region
20Years

Notable Signals

No notable trend signals for Least Bittern in Sonoran and Mojave Deserts. See the full index history below.

Forecast

If the recent trend holds, Least Bittern in Sonoran and Mojave Deserts is projected to stay roughly flat through 2028, near 0.07 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±159.3%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2028
0.07Projected 2028 index
0.00–0.1595% range
±159.3%Backtest error
19792028
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
20240.070.000.15
20250.070.000.15
20260.070.000.15
20270.070.000.15
20280.070.000.15

Routes In Sonoran and Mojave Deserts

Routes recording Least Bittern in Sonoran and Mojave Deserts.
Cibola LakeARIZONA32017
LagunaARIZONA12010
ArabyARIZONA12023
Palo VerdeCALIFORNIA12022
NilandCALIFORNIA11979
Ash MeadowsNEVADA12018

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