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

Varied Thrush In BCR 4

All regionsBCR 4Forest birds

Varied Thrush in BCR 4 has edged down: down 14% on the route-weighted index since 1976.

-14%Since 1976
67Routes In Region
47Years

Notable Signals

No notable trend signals for Varied Thrush in BCR 4. See the full index history below.

Forecast

If the recent trend holds, Varied Thrush in BCR 4 is projected to rise about 40% by 2029 — from 6.9 in 2024 to a central estimate of 9.7 (95% range 3.0–16). A 5-year backtest shows a typical error of ±42.2%, with 100% of held-out values landing inside the 95% band.

+40%Change by 2029
9.7Projected 2029 index
3.0–1695% range
±42.2%Backtest error
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 index95% low95% high
2025103.417
2026103.317
20279.93.217
20289.83.117
20299.73.016

Routes In BCR 4

Routes recording Varied Thrush in BCR 4.
TatalinaALASKA402019
HomerALASKA371982
PetersvilleALASKA332024
Seven LakesALASKA282023
Unalakleet RiverALASKA272024
Chena Hot Spring 2ALASKA262024
Bear CreekALASKA251991
Swan Lake RdALASKA252023
L SalchaALASKA232023
ChickenALASKA202024
WasillaALASKA201983
Mt. FairplayALASKA202024
RubyALASKA202024
MatanuskaALASKA191983
Goose BayALASKA181982
Kobuk River (Short)ALASKA151992
Skilak LakeALASKA141985
Koyukuk Riv.ALASKA142001
Anvik RiverALASKA132024
Chatanika RALASKA122023
Chena RiverALASKA121988
Nabesna RoadALASKA122024
SlanaALASKA112024
Ft. RichrdsnALASKA102023
LivengoodALASKA92021

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