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

Scaled Quail In Sierra Madre Occidental

All regionsSierra Madre OccidentalGeneralists

Scaled Quail in Sierra Madre Occidental has declined: down 37% on the route-weighted index since 1970.

-37%Since 1970TrendPercent 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 →
12Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
54YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

No notable trend signals for Scaled Quail in Sierra Madre Occidental. See the full index history below.

Scaled Quail In Sierra Madre Occidental Population Forecast

If the recent trend holds, Scaled Quail in Sierra Madre Occidental is projected to fall about 62% by 2029 — from 2.2 in 2024 to a central estimate of 0.84 (95% range 0.00–5.6). A 5-year backtest shows a typical error of ±52.6%, with 100% of held-out values landing inside the 95% band.

-62%Change by 2029TrendPercent 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 →
0.84Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–5.695% 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 →
±52.6%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, Scaled Quail in Sierra Madre Occidental is projected to fall about 62% by 2029 — from 2.2 in 2024 to a central estimate of 0.84 (95% range 0.00–5.6). A 5-year backtest shows a typical error of ±52.6%, with 100% of held-out values landing inside the 95% band.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 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 →
20251.10.005.8
20261.000.005.7
20270.950.005.7
20280.890.005.6
20290.840.005.6

Routes In Sierra Madre Occidental

Routes recording Scaled Quail in Sierra Madre Occidental.
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 →
McnealARIZONA222024
DragoonARIZONA162009
SunizonaARIZONA151997
RuckerARIZONA132009
Sunizona 2ARIZONA92024
AmadoARIZONA32023
Vicks PeakNEW-MEXICO32024
PomereneARIZONA22024
San SimonARIZONA22023
SahuaritaARIZONA22024
MagdalenaNEW-MEXICO22024
PortalARIZONA12022

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