basal knob duck
It also occurs in continental South America south to the Paraguay River region in eastern Paraguay, southeastern Brazil and the extreme northeast of Argentina, and as a vagrant on Trinidad. However, knob-billed ducks in immature plumage are rarely seen without adults nearby and thus they are usually easily identified too. Mute Swan: Aggressive bird, entirely white, orange bill with large black basal knob and naked black lores. And the knob become pronounced enough by 6-8 weeks of age that it can be used for determining their gender. Most taxonomic authorities split this species and the comb duck from each other. If seen at a distance, they can also be mistaken for a fulvous whistling-duck (Dendrocygna bicolor) or a female maned duck (Chenonetta jubata). They defend the females and young but not the nest sites. 03 of 30 Wings are black with large white patches visible in flight. Length can range from 56 to 76 cm (22 to 30 in), wingspan ranges from 116 to 145 cm (46 to 57 in) and weight from 1.03 to 2.9 kg (2.3 to 6.4 lb). Immature knob-billed ducks look like a large greyish female of the cotton pygmy goose (Nettapus coromandelicus) and may be difficult to tell apart if no other birds are around to compare size and hue. Young birds are dull buff below and on the face and neck, with dull brown upperparts, top of the head and eyestripe. The crown and nape are pale blue; distinct bill is orange-red, sweeping upward into a large, orange basal knob outlined in black. "https://secure." For the location, please provide the district name or the national park/ wildlife sanctuary name. Tail has white patches at the base. While geese and some ducks are often found along the shoreline, species that feed on underwater vegetation such as swans and dabbling ducks prefer calm water with depths suited to the length of their necks. Basal knobs vary considerably from other bill structures, and birders need to recognize the different parts of a bird's bill to properly notice a basal knob. The size, shape, and color of the basal knob, as well as its proportions to the bird's bill size overall, can help with species identification, especially at distances where finer facial details may not be visible but the silhouette of the knob can be a good clue.  Adults have a white head freckled with dark spots, and a pure white neck and underparts. : "http://www. ← Red-shouldered Macaw (Diopsittaca nobilis), long-tailed broadbill (Psarisomus dalhousiae) →. Most taxonomic authorities split this species and the comb duck from each other. King Eider: Breeds in the Canadian Arctic, coastal Greenland, northern Alaska, and Siberia. The knob-billed duck, or African comb duck, is a duck found in tropical wetlands in Sub-Saharan Africa, Madagascar and south Asia from Pakistan to Laos and extreme southern China. All species have webbed feet suited to their aquatic environments and distinctive flat bills - except for the mergansers with their thin, serrated bills ideally suited for catching fish.
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