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The Indian spot-billed duck was described by the naturalist Johann Reinhold Forster in 1781 under its current binomial name Anas poecilorhyncha. [2] [3] The name of the genus Anas is the Latin word for a duck. The specific epithet poecilorhyncha combines the classical Greek words poikilos meaning "pied" or "spotted" and rhunkhos meaning a "bill ...
The juvenile is paler than the adult, has a whitish breast, and lacks the facial shield; the adult black plumage develops when about 3–4 months old, but the white shield is only fully developed at about one year old. The Eurasian coot is a noisy bird with a wide repertoire of crackling, explosive, or trumpeting calls, often given at night.
The eastern spot-billed duck was described by the English biologist Robert Swinhoe in 1866 under its current binomial name Anas zonorhyncha. [2] [3] The name of the genus Anas is the Latin word for a duck. The specific epithet zonorhyncha is derived from the classical Greek words zōnē meaning "band" or "girdle" and rhunkhos meaning "bill". [4]
The Hook Bill is a light duck, with an average weight of approximately 2 kg. [6]: 417 Three colour variants are recognised in France, the Netherlands and the United Kingdom: [8] the dusky mallard has a black head and rump with green lustre, the body in shades of grey with no white neck-ring, and a slate-grey beak; the white-bibbed dusky mallard is similarly coloured, but with a distinct white ...
The nail is the black tip of this mute swan's beak. All birds of the family Anatidae (ducks, geese, and swans) have a nail, a plate of hard horny tissue at the tip of the beak. [60] This shield-shaped structure, which sometimes spans the entire width of the beak, is often bent at the tip to form a hook. [61]
The knob-billed duck (Sarkidiornis melanotos) or African comb duck is a type of duck found along the tropical/sub-tropical wetlands and waterways of Sub-Saharan Africa and the island of Madagascar, as well as most of South Asia and mainland Indochina. Most taxonomic authorities classify the knob-billed duck and the comb duck separately.
The outer secondaries are tipped with white and the inner ones have black margins. The plumage of the two sexes are mostly the same, although the female has slightly less chestnut in the chest. [17] The pinkish-white bill has fleshy flaps of skin hanging from the sides of its tip.
The specific epithet albellus is a Latin diminutive of albus meaning "white". [8] The term smew has been used since the 17th century and is of uncertain origin. It is believed to be related to the Dutch smient ("wigeon") and the German Schmeiente or Schmünte, "wild duck." [9] It is probably derived from smee, a dialectal term for a wild duck ...