Species, Age and Sex Identification of Ducks Using Wing Plumage
Ruddy Duck
| Wing Character | Adult | Immature |
| Tertial coverts | Broadly rounded at tips | Somewhat squared at tips, appearing trapezoidal |
| Tertials | Broad-tipped, curved and drooping | Straight, often somewhat frayed at their tips |
| Middle coverts | Rounded and smooth-edged | Slightly trapezoidal, often rough-ended |
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