Species · Maryland · BBS 2025 Release · 1966–2024
Common Gallinule Population Trend in Maryland
Common Gallinule in Maryland has declined: down 27% on the route-weighted index since 1975.
-27%Since 1975
3Routes In State
24Years
Notable Common Gallinule Trends in Maryland
No notable trend signals for Common Gallinule in Maryland. See the full index history below.
Common Gallinule Population Forecast in Maryland
If the recent trend holds, Common Gallinule in Maryland is projected to stay roughly flat through 2027, near 0.02 (95% range 0.00–0.03). A 5-year backtest shows a typical error of ±20.2%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2027
0.02Projected 2027 index
0.00–0.0395% range
±20.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2023 | 0.02 | 0.00 | 0.04 |
| 2024 | 0.02 | 0.00 | 0.04 |
| 2025 | 0.02 | 0.00 | 0.03 |
| 2026 | 0.02 | 0.00 | 0.03 |
| 2027 | 0.02 | 0.00 | 0.03 |
Common Gallinule Survey Routes in Maryland
Common Gallinule Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.