Speculum feathers

The speculum is a patch, often distinctly coloured, on the secondary wing feathers, or remiges, of some birds.

Examples of the colour(s) of the speculum in a number of ducks are: 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,[5] though in this case the colors are pigmentary and non-iridescent.