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

Pygmy Nuthatch In Sierra Madre Occidental

All regionsSierra Madre OccidentalForest birds

Pygmy Nuthatch in Sierra Madre Occidental has held roughly steady: down 0% on the route-weighted index since 1970.

-0%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 →
20Routes 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 Pygmy Nuthatch in Sierra Madre Occidental. See the full index history below.

Forecast

If the recent trend holds, Pygmy Nuthatch in Sierra Madre Occidental is projected to rise about 35% by 2029 — from 5.4 in 2024 to a central estimate of 7.3 (95% range 2.1–12). A 5-year backtest shows a typical error of ±24.7%, with 100% of held-out values landing inside the 95% band.

+35%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 →
7.3Projected 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 →
2.1–1295% 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 →
±24.7%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, Pygmy Nuthatch in Sierra Madre Occidental is projected to rise about 35% by 2029 — from 5.4 in 2024 to a central estimate of 7.3 (95% range 2.1–12). A 5-year backtest shows a typical error of ±24.7%, 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 →
20257.22.012
20267.22.112
20277.22.112
20287.32.112
20297.32.112

Routes In Sierra Madre Occidental

Routes recording Pygmy Nuthatch 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 →
Happy JackARIZONA642024
ReserveNEW-MEXICO402023
WilliamsARIZONA302019
PinetopARIZONA292022
Mormon LakeARIZONA281975
SprucedaleARIZONA282023
Forest LakesARIZONA252024
FlagstaffARIZONA212022
Tonto Vill.ARIZONA172021
PrescottARIZONA162022
AlpineARIZONA92023
Mt. GrahamARIZONA92023
BlueARIZONA61991
Aztec PeakARIZONA51978
Emory PassNEW-MEXICO42024
MaineARIZONA22024
Carr MtnARIZONA22019
PortalARIZONA22024
RuckerARIZONA12007
Vicks PeakNEW-MEXICO12023

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