Speculum



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 and Green-winged Teal: Iridescent green edged with buff.
 * Blue-winged Teal: Iridescent green . The species' common name comes from the sky-blue wing coverts.
 * Crested Duck and Bronze-winged Duck: Iridescent purple-bronze, edged white.
 * Pacific Black Duck: Iridescent green, edged light buff.
 * Mallard: Iridescent purple-blue with white edges.
 * American Black Duck: Iridescent violet bordered in black and may have a thin white trailing edge.
 * Northern Pintail: Iridescent green in male and brown in female, both are white on trailing edge.
 * Gadwall: Both sexes have white inner secondaries.
 * 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, though in this case the colors are pigmentary and non-iridiscent.