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

Bell's Vireo In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsForest birds

Bell's Vireo in Sonoran and Mojave Deserts has risen sharply: up 58% on the route-weighted index since 1970.

+58%Since 1970
29Routes In Region
45Years

Notable Signals

long arc increasecomputed index

Bell's Vireo has risen sharply in Sonoran and Mojave Deserts: up 58% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Bell's Vireo in Sonoran and Mojave Deserts is projected to rise about 523% by 2029 — from 0.13 in 2024 to a central estimate of 0.83 (95% range 0.21–1.5). A 5-year backtest shows a typical error of ±336.6%, with 40% of held-out values landing inside the 95% band.

+523%Change by 2029
0.83Projected 2029 index
0.21–1.595% range
±336.6%Backtest error
19682029
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
20250.780.151.4
20260.790.171.4
20270.800.181.4
20280.820.191.4
20290.830.211.5

Routes In Sonoran and Mojave Deserts

Routes recording Bell's Vireo in Sonoran and Mojave Deserts.
Cutter 2ARIZONA172018
PisinimoARIZONA101993
AjoARIZONA32001
Red RockARIZONA32014
Casa GrandeARIZONA32023
Ajo 2ARIZONA32017
TecopaCALIFORNIA32023
FlorenceARIZONA21988
Red Rock 2ARIZONA22024
OatmanARIZONA11994
New RiverARIZONA12009
LagunaARIZONA12006
DatelandARIZONA12016
CoolidgeARIZONA11974
LukevilleARIZONA11979
RivieraARIZONA12018
Alamo Res.ARIZONA12018
Palo VerdeARIZONA12010
Cabeza PrietARIZONA12019
Cactus ForestARIZONA12019
Organ PipeARIZONA12021
Palo Verde 2ARIZONA12021
Bates WellARIZONA12022
WildroseCALIFORNIA12004
Anza BorregoCALIFORNIA12024

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