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The ring-necked duck (Aythya collaris) is a diving duck from North America commonly found in freshwater ponds and lakes. [3] The scientific name is derived from Greek aithuia , an unidentified seabird mentioned by authors including Hesychius and Aristotle , and Latin collaris , "of the neck" from collum , "neck".
The diving ducks, commonly called pochards or scaups, are a category of duck which feed by diving beneath the surface of the water. They are part of Anatidae, the diverse and very large family that includes ducks, geese, and swans. The diving ducks are placed in a distinct tribe in the subfamily Anatinae, the Aythyini.
This is a large duck, and the male's long central tail feathers give rise to the species' English and scientific names. Both sexes have blue-grey bills and grey legs and feet. The drake is more striking, having a thin white stripe running from the back of its chocolate-coloured head down its neck to its mostly white undercarriage.
The male has a long pointed tail (10 to 15 cm (3.9 to 5.9 in) long) and a dark grey bill crossed by a pink band. In winter, the male has a dark cheek patch on a mainly white head and neck, a dark breast and mostly white body. In summer, the male is dark on the head, neck and back with a white cheek patch.
Aythya is a genus of diving ducks, with twelve species currently accepted. [2] The genus was described in 1822 by the German zoologist Friedrich Boie, with the type species being greater scaup. [3] [4] The name Aythya comes from the Ancient Greek word αἴθυιᾰ (aithuia), which referred to an unknown diving-bird. [5] [6]
A male mallard duck. Subfamily: Aythyinae, diving ducks (Some 15 species of diving ducks, of worldwide distribution, in two to four genera; The 1986 morphological analysis [10] suggested the probably extinct pink-headed duck of India, previously treated separately in Rhodonessa, should be placed in Netta, but this has been questioned. [15]
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The double-crested cormorant is a large waterbird with a stocky body, long neck, medium-sized tail, webbed feet, and a medium-sized hooked bill. It has a body length of between 70 and 90 cm (28 and 35 in) long, with a wingspan of between 114 and 123 cm (45 and 48 in).