The Knob-billed Duck is silent except for a low croak when flushed.

Knob-billed Ducks nest mainly in tree holes, also in tall grass.

Knob-billed Ducks often perch in trees.

However, Knob-billed Ducks in immature plumage are rarely seen without adults nearby and thus they are usually easily identified too.

Last recorded sighting of Knob-billed Duck, now thought be extinct in Sri Lanka, occurred in here.

As the "perching ducks" were split up, the Knob-billed Duck was moved to the Tadorninae or shelduck subfamily.

Deep in the mopane we came upon shallow pans still filled with water and teeming with birds; spurwing geese, knob-billed duck, plovers with lemon-yellow wattles.

The Knob-billed Duck is declining in numbers locally, but due to its wide range it is not considered globally threatened by the IUCN.

In the natural history wing, there are the stuffed carcasses of a yellow baboon, a black lechwe antelope, a knob-billed duck and other animals that have roamed the area for centuries.

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.

The Knob-billed Duck (Sarkidiornis melanotos), or Comb Duck, is an unusual, pan-tropical duck, found in tropical wetlands in sub-Saharan Africa, Madagascar and south Asia from Pakistan to Laos and extreme southern China.

Sarkidiornis, Comb Duck - Tadorninae or closer to dabbling ducks?

The famous Kamaldah lake attracts several varieties of water birds including the common whistling and cotton teal, the comb duck, snipe and geese.

Among the game birds resident in the state are the snipe, comb duck, grey duck, cotton teal and whistling teal.

Comb Duck Sarkidiornis melanotos: Tadorninae or basal Anatinae?

The most common birds found in the state are doves, peacocks, junglefowl, black partridge, house sparrows, songbirds, blue jays, parakeets, quails, bulbuls, and comb ducks.

ANATIDAE Sarkidiornis melanotos (Comb Duck)

Local birds include Comb Duck, Whistling Teel, Spot Bill, Spoon Bill, King Fisher, Vulture etc.

The supposed extinct "Mauritian Comb Duck" is based on misidentified remains of the Mauritian Shelduck (Alopochen mauritianus); this was realized as early as 1897, but the mistaken identity can still occasionally be found in recent sources.

He observed large numbers of pelicans, open-billed storks, wood ibis, sacred ibis, marabout, saddleback and hammerheaded storks, fishing eagles, lily-trotters, grey herons, spurwing geese, comb duck, whistling teal and common teal.

Over 250 varieties of birds here include local birds such as comb duck, spot bill, spoon bill, kingfisher and vulture, and migratory birds such as greleg googe, pin tail, common teel, vision, showler and surkhab.

Numerous bird species occur, including the great crested grebe, comb duck, pink-billed lark, black-bellied bustard, African grass-owl and bigger birds like the yellow-billed duck, greater flamingo, lesser flamingo, whiskered tern, osprey and a few fish eagle.

The most common waterfowl are gadwall, shoveler, common teal, cotton teal, tufted duck, comb duck, little cormorant, great cormorant, Indian shag, ruff, painted stork, white spoonbill, Asian open-billed stork, oriental ibis, darter, common sandpiper, wood sandpiper and green sandpiper.