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

Common Eider In BCR 2

All regionsBCR 2Waterfowl

Common Eider in BCR 2 has surged: up 139% on the route-weighted index since 1993.

+139%Since 1993
5Routes In Region
26Years

Notable Signals

long arc increasecomputed index

Common Eider has surged in BCR 2: up 139% on the route-weighted index since 1993.

Forecast

If the recent trend holds, Common Eider in BCR 2 is projected to rise about 426% by 2029 — from 1.8 in 2024 to a central estimate of 9.3 (95% range 0.61–18). A 5-year backtest shows a typical error of ±307.3%, with 60% of held-out values landing inside the 95% band.

+426%Change by 2029
9.3Projected 2029 index
0.61–1895% range
±307.3%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
20258.70.0017
20268.80.1018
20279.00.2718
20289.20.4418
20299.30.6118

Routes In BCR 2

Routes recording Common Eider in BCR 2.
Kodiak 2ALASKA222009
Cape NomeALASKA162024
KotzebueALASKA152010
CouncilALASKA22023
KodiakALASKA11983

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