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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 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 ...
A tufted duck × common pochard hybrid. Note the casual resemblance to a lesser scaup in head shape, but distinguishable by the more uniform (less vermiculated) mantle feathers, and the bill pattern with a pale band and large black tip (uniform bluish in lesser scaup).
Lesser Scaup generally have a smaller and straighter bill, with a relatively narrow profile, while Greater Scaup have a wider, more spatulate profile toward the tip of the bill. The dark nail tip averages wider on Greater Scaup. [10] In flight, the most tell-tale sign is the white secondary remiges, whereas in the greater scaup the white ...
Males have a purplish-black head, neck and breast with gray sides, a white area on the crissum (the area around the cloaca), and a bright red bill and red eyes. [ 9 ] [ 2 ] The bill has a large rounded knob, which is bright red, and rest of the bill gradually fades towards a pale pink before ending with a black tip. [ 9 ]
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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.