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

Pigeon Guillemot In BCR 2

All regionsBCR 2Generalists

Pigeon Guillemot in BCR 2 has fallen sharply: down 61% on the route-weighted index since 1987.

-61%Since 1987
4Routes In Region
35Years

Notable Signals

long arc declinecomputed index

Pigeon Guillemot has fallen sharply in BCR 2: down 61% on the route-weighted index since 1987.

Forecast

If the recent trend holds, Pigeon Guillemot in BCR 2 is projected to fall about 11% by 2029 — from 0.44 in 2024 to a central estimate of 0.39 (95% range 0.00–2.1). A 5-year backtest shows a typical error of ±216.6%, with 100% of held-out values landing inside the 95% band.

-11%Change by 2029
0.39Projected 2029 index
0.00–2.195% range
±216.6%Backtest error
19852029
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
20250.550.002.3
20260.510.002.2
20270.470.002.2
20280.430.002.1
20290.390.002.1

Routes In BCR 2

Routes recording Pigeon Guillemot in BCR 2.
Kodiak 2ALASKA32024
Cold Bay (Short)ALASKA31991
Cold BayALASKA22007
ChiniakALASKA12024

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