BirdAnalyst
Species · BCR 4 · BBS 2025 Release · 1966–2024

Great Gray Owl In BCR 4

All regionsBCR 4Generalists

Great Gray Owl in BCR 4 has increased: up 35% on the route-weighted index since 1996.

+35%Since 1996TrendPercent 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 →
10Routes 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 →
19YearsYears 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 Great Gray Owl in BCR 4. See the full index history below.

Great Gray Owl In BCR 4 Population Forecast

If the recent trend holds, Great Gray Owl in BCR 4 is projected to stay roughly flat through 2029, near 0.04 (95% range 0.01–0.08). A 5-year backtest shows a typical error of ±40.8%, with 100% of held-out values landing inside the 95% band.

n/aChange 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 →
0.04Projected 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 →
0.01–0.0895% 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 →
±40.8%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, Great Gray Owl in BCR 4 is projected to stay roughly flat through 2029, near 0.04 (95% range 0.01–0.08). A 5-year backtest shows a typical error of ±40.8%, with 100% of held-out values landing inside the 95% band.19942029
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 →
20250.040.000.08
20260.040.000.08
20270.040.000.08
20280.040.000.08
20290.040.010.08

Routes In BCR 4

Routes recording Great Gray Owl in BCR 4.
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 →
EagleALASKA12024
CircleALASKA12022
Lake LouiseALASKA11998
Nicholai SlALASKA12021
Hather CreekALASKA11994
Mud RiverALASKA12019
TatalinaALASKA12001
Kanuti LakeALASKA12021
Nabesna RoadALASKA12011
KuskulanaALASKA11998

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