Speculum feathers

The speculum is a patch, often distinctly coloured, on the inner remiges of some birds.

Examples of the colour(s) of the speculum in a number of ducks are:

* Common Teal: Iridescent green.
* Green-winged Teal: Iridescent green.
* Blue-winged Teal: Iridescent blue.
* Pacific Black Duck: Iridescent green, edged light buff.
* Mallard: Iridescent purple-blue with white edges.
* American Black Duck: Iridescent purple-blue (not edged white).
* Northern Pintail: Iridescent greenish black, edged white at back and orange in front.
* Gadwall: Small and white, but only obvious in male
* Yellow-billed Duck: Iridescent green or blue, bordered white.

Bright wing speculums are also known from a number of other birds; among them are several parrots from the genus "Amazona" with red or orange speculums.