BirdAnalyst
Species · BCR 2 · BBS 2025 Release · 1966–2024

Black-billed Magpie In BCR 2

All regionsBCR 2Generalists

Black-billed Magpie in BCR 2 has fallen sharply: down 74% on the route-weighted index since 1985.

-74%Since 1985
11Routes In Region
41Years

Notable Signals

long arc declinecomputed index

Black-billed Magpie has fallen sharply in BCR 2: down 74% on the route-weighted index since 1985.

Forecast

If the recent trend holds, Black-billed Magpie in BCR 2 is projected to fall about 100% by 2029 — from 2.6 in 2024 to a central estimate of 0.00 (95% range 0.00–6.1). A 5-year backtest shows a typical error of ±100.1%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–6.195% range
±100.1%Backtest error
19832029
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
20250.690.006.8
20260.510.006.6
20270.330.006.4
20280.150.006.3
20290.000.006.1

Routes In BCR 2

Routes recording Black-billed Magpie in BCR 2.
Kodiak 2ALASKA172024
KodiakALASKA141984
DillinghamALASKA52017
Cold BayALASKA52024
Katmai N.P.ALASKA22018
Goodnews BayALASKA22005
Cold Bay (Short)ALASKA21992
ChiniakALASKA12024
King SalmonALASKA12023
Togiak RiverALASKA12005
Kanektok RivALASKA12003

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