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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. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「speculum feathers」の詳細全文を読む スポンサード リンク
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