Flickr - law keven - Happy Feathery Friday

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 Duck is the common name for numerous species of waterfowl in the family (biology), family Anatidae. Ducks are generally smaller and shorter-necked than swans and goose, geese, which are members of the same family. Divided among several subfam ...

are: *

Common teal The Eurasian teal (''Anas crecca''), common teal, or Eurasian green-winged teal is a common and widespread duck that breeds in temperate Eurosiberia and migrates south in winter. The Eurasian teal is often called simply the teal due to being th ...

and

green-winged teal The green-winged teal (''Anas carolinensis'') or American teal is a common and widespread duck that breeds in the northern areas of North America except on the Aleutian Islands. It was considered conspecific with the Eurasian teal (''A. crecca'' ...

: Iridescent green edged with buff. *

Blue-winged teal The blue-winged teal (''Spatula discors'') is a species of bird in the duck, goose, and swan family Anatidae. One of the smaller members of the dabbling duck group, it occurs in North America, where it breeds from southern Alaska to Nova Scotia, ...

: Iridescent green. The species' common name comes from the

sky-blue Sky blue refers to a collection of shades comparable to that of a clear daytime sky. Typically it is a shade of cyan or light teal, though some iterations are closer to light azure or light blue. The term (as "sky blew") is attested from 1681 ...

wing coverts. *

Crested duck The crested duck or South American crested duck (''Lophonetta specularioides'') is a species of duck native to South America, belonging to the monotypic genus ''Lophonetta''. It is sometimes included in ''Anas'', but it belongs to a South Americ ...

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 The mallard () or wild duck (''Anas platyrhynchos'') is a dabbling duck that breeds throughout the temperate and subtropical Americas, Eurasia, and North Africa. It has been introduced to New Zealand, Australia, Peru, Brazil, Uruguay, Arge ...

: Iridescent purple-blue with white edges. * American black duck: Iridescent violet bordered in black and may have a thin white trailing edge. *

Northern pintail The pintail or northern pintail (''Anas acuta'') is a duck species with wide geographic Range (biology), distribution that breeds in the northern areas of Europe and across the Palearctic and North America. It is bird migration, migratory an ...

: Iridescent green in male and brown in female, both are white on trailing edge. *

Gadwall The gadwall (''Mareca strepera'') is a common and widespread dabbling duck in the family Anatidae. Taxonomy The gadwall was first described by Carl Linnaeus in his landmark 1758 10th edition of ''Systema Naturae''. DNA studies have shown th ...

: Both sexes have white inner secondaries. *

Yellow-billed duck The yellow-billed duck (''Anas undulata'') is a 51–58 cm long dabbling duck which is an abundant resident breeder in southern and eastern Africa. This duck is not migratory, but wanders in the dry season to find suitable waters. It is hig ...

: Iridescent green or blue, bordered white. Bright wing speculums are also known from a number of other

; 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 Amazon parrots are parrots in the genus ''Amazona''. They are medium-sized, short-tailed parrots native to the Americas, with their range extending from South America to Mexico and the Caribbean. ''Amazona'' is one of the 92 genera of parrots t ...

'' with red or orange speculums, though in this case the colors are pigmentary and non-iridescent.

References

{{DEFAULTSORT:Speculum Feathers Feathers Ducks