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The speculum is a patch, often distinctly coloured, on the secondary wing feathers, or ''remiges'', of some
The speculum is a patch, often distinctly coloured, on the secondary wing feathers, or ''remiges'', of some birds
Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...
.
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
The Pacific black duck (''Anas superciliosa''), commonly known as the PBD, is a dabbling duck found in much of Indonesia, New Guinea, Australia, New Zealand, and many islands in the southwestern Pacific, reaching to the Caroline Islands in the no ...
: 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
Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...
; among them are several parrots
Parrots (Psittaciformes), also known as psittacines (), are birds with a strong curved beak, upright stance, and clawed feet. They are classified in four families that contain roughly 410 species in 101 genus (biology), genera, found mostly in ...
from the genus
Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
'' Amazona'' with red or orange speculums, though in this case the colors are pigmentary and non-iridescent.
References
{{DEFAULTSORT:Speculum Feathers Feathers Ducks