BirdAnalyst
Species · BCR 34 · BBS 2025 Release · 1966–2024

Sulphur-bellied Flycatcher In Sierra Madre Occidental

All regionsSierra Madre OccidentalAerial insectivores

Sulphur-bellied Flycatcher in Sierra Madre Occidental has declined: down 31% on the route-weighted index since 1975.

-31%Since 1975
6Routes In Region
44Years

Notable Signals

No notable trend signals for Sulphur-bellied Flycatcher in Sierra Madre Occidental. See the full index history below.

Forecast

If the recent trend holds, Sulphur-bellied Flycatcher in Sierra Madre Occidental is projected to fall about 47% by 2029 — from 0.22 in 2024 to a central estimate of 0.12 (95% range 0.00–0.40). A 5-year backtest shows a typical error of ±32.1%, with 100% of held-out values landing inside the 95% band.

-47%Change by 2029
0.12Projected 2029 index
0.00–0.4095% range
±32.1%Backtest error
19692029
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
20250.130.000.41
20260.130.000.40
20270.120.000.40
20280.120.000.40
20290.120.000.40

Routes In Sierra Madre Occidental

Routes recording Sulphur-bellied Flycatcher in Sierra Madre Occidental.
PortalARIZONA32024
PatagoniaARIZONA22022
SunizonaARIZONA21978
Aztec PeakARIZONA11977
Sunizona 2ARIZONA12024
RuckerARIZONA12009

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