Speculum feathers
From Wikipedia, the free encyclopedia
The speculum feathers are the inner (secondary) flight feathers of a duck. They are often brightly coloured, especially in dabbling ducks, and can help to identify a duck in flight.
Examples are:
- Common Teal: green
- Green-winged Teal: green
- Blue-winged Teal: blue
- Pacific Black Duck: green, edged light buff
- Mallard: white-edged purple-blue
- American Black Duck: purple-blue (not edged white)
- Northern Pintail: greenish black, edged white at back and orange in front
- Gadwall: small and white, but only obvious in male
- Yellow-billed Duck: green or blue, bordered white
