Species · Maine · BBS 2025 Release · 1966–2024
Common Eider Population Trend in Maine
Common Eider in Maine has surged: up 26× on the route-weighted index since 1993.
26×Since 1993
3Routes In State
25Years
Notable Common Eider Trends in Maine
long arc increasecomputed index
Common Eider has surged in Maine: up 26× on the route-weighted index since 1993.
Common Eider Population Forecast in Maine
If the recent trend holds, Common Eider in Maine is projected to rise about 28% by 2029 — from 2.7 in 2024 to a central estimate of 3.4 (95% range 0.42–6.4). A 5-year backtest shows a typical error of ±75.5%, with 0% of held-out values landing inside the 95% band.
+28%Change by 2029
3.4Projected 2029 index
0.42–6.495% range
±75.5%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 3.0 | 0.02 | 6.0 |
| 2026 | 3.1 | 0.12 | 6.1 |
| 2027 | 3.2 | 0.22 | 6.2 |
| 2028 | 3.3 | 0.32 | 6.3 |
| 2029 | 3.4 | 0.42 | 6.4 |
Common Eider Survey Routes in Maine
| Kittery Pt | 51 | 2024 | 1978 |
| Newcastle | 5 | 1997 | 1997 |
| Forest Sta | 1 | 1984 | 1984 |
Common Eider Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.