Mexican Duck
Mexican Duck has surged: up 143% on the route-weighted index since 1986.
About the Mexican Duck
The Mexican Duck (Anas diazi) is a North American member of the Ducks, Geese & Waterfowl (Anatidae). In this analysis it is grouped with the waterfowl.
- Size
- 12–43.5 in long (30–110 cm) — a medium to large waterfowl (typical for the family)
- Habitat
- Lakes, ponds, rivers, marshes and sheltered coastal waters.
- Diet
- Aquatic plants, seeds and invertebrates, dabbled at the surface or dived for.
- Range
- Recorded on 32 Breeding Bird Survey routes across 3 states, most concentrated in the Chihuahuan Desert.
- Family
- Anatidae · Waterfowl
Notable Mexican Duck Trends
No notable trend signals for Mexican Duck. See the full index history below.
Mexican Duck Population Forecast
If the recent trend holds, Mexican Duck is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.02). A 5-year backtest shows a typical error of ±68.5%, with 100% of held-out values landing inside the 95% band.
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.01 | 0.00 | 0.02 |
| 2026 | 0.01 | 0.00 | 0.02 |
| 2027 | 0.01 | 0.00 | 0.02 |
| 2028 | 0.01 | 0.00 | 0.02 |
| 2029 | 0.01 | 0.00 | 0.02 |
Where the Mexican Duck Is Detected
BBS routes recording Mexican Duck, sized by most recent count.
Mexican Duck Population Trend by State
| Arizona | insufficient data | n/a | 8 |
| New Mexico | -83% | 1993 | 8 |
| Texas | -39% | 1992 | 16 |
Mexican Duck Population Trend by Region
Bird Conservation Regions are the ecological unit for trends.
| Chihuahuan Desert | +43% | 1988 | 18 |
| Tamaulipan Brushlands | +2% | 2002 | 5 |
Mexican Duck Conservation Status
Our route-weighted index shows it up about 142% since 1986.
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. Trend is a route-weighted relative-abundance index, not an absolute population.