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Species · BCR 2 · BBS 2026 Release · 1966–2025

Red-breasted Nuthatch In BCR 2

All regionsBCR 2Forest birds

Red-breasted Nuthatch in BCR 2 has declined: down 48% on the route-weighted index since 1993.

-48%Since 1993TrendPercent 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 →
4Routes 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 →
26YearsYears 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 Red-breasted Nuthatch in BCR 2. See the full index history below.

Red-breasted Nuthatch In BCR 2 Population Forecast

If the recent trend holds, Red-breasted Nuthatch in BCR 2 is projected to rise about 119% by 2030 — from 0.17 in 2025 to a central estimate of 0.36 (95% range 0.00–0.82). A 5-year backtest shows a typical error of ±95.3%, with 80% of held-out values landing inside the 95% band.

+119%Change by 2030TrendPercent 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 →
0.36Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.8295% 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 →
±95.3%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, Red-breasted Nuthatch in BCR 2 is projected to rise about 119% by 2030 — from 0.17 in 2025 to a central estimate of 0.36 (95% range 0.00–0.82). A 5-year backtest shows a typical error of ±95.3%, with 80% of held-out values landing inside the 95% band.19852030
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 →
20260.340.000.80
20270.350.000.81
20280.350.000.81
20290.360.000.82
20300.360.000.82

Routes In BCR 2

Routes recording Red-breasted Nuthatch in BCR 2.
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 →
DillinghamALASKA32019
Katmai N.P.ALASKA12000
ChiniakALASKA12025
Kodiak 2ALASKA12024

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.