Indian spot-billed duck

The Indian spot-billed duck was described by the naturalist Johann Reinhold Forster in 1781 under its current binomial name Anas poecilorhyncha. 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". A molecular phylogenetic study published in 2009 that compared mitochondrial DNA sequences from ducks, geese and swans in the family Anatidae found that the Indian spot-billed duck was a sister species to a clade containing the Mexican duck, the American black duck, the mottled duck and the mallard. A 2014 study, however, shows that there is discordance between the phylogenies obtained using nuclear DNA sequences; the Indian spot-bill appears to be closer to the Laysan and Hawaiian ducks and forming a sister clade to the New World and Old World mallards and the Mexican, American black and mottled ducks. There is significant hybridization between Old World mallards and eastern spot-billed ducks, leading to a closeness in their mitochondrial DNA that alters the apparent phylogenies. Two subspecies are recognised although intergradation is possible (intermediates between haringtoni and eastern spot-billed duck have been recorded): • A. p. poecilorhyncha Forster, 1781 – India and Sri Lanka • A. p. haringtoni (Oates, 1907) – Myanmar to southern China and Laos (named after Herbert Hastings Harington (1868–1916)) The eastern spot-billed duck was formerly considered as a third subspecies. Fieldwork carried out at Hong Kong in southern China and published in 2006 found that although both the eastern spot-billed duck and the Indian spot-billed duck (subspecies A. p. haringtoni) bred in the region at the same time, mixed pairs were only very rarely observed. Based on this observation most taxonomists now treat the eastern spot-billed duck as a separate species. ==Description==

This duck is around the same size as a mallard and has a scaly patterned body with a green speculum bordered by white. At rest the white stripe stands out and the long neck and the bill with yellow tip and orange red spots at the base are distinctive in the nominate subspecies. In flight it is distinguished by the green speculum with a broad white band at the base. The red spots at the base of the bills are absent in haringtoni. It measures in length and across the wings, with a body mass of . These are mainly grey ducks with a paler head and neck and a black bill tipped bright yellow. The wings are whitish with black flight feathers below, and from above show a white-bordered green The male has a red spot on the base of the bill, which is absent or inconspicuous in the smaller but otherwise similar female. The male does not have an eclipse plumage. The legs and feet are bright orange to coral red. Juveniles are browner and duller than adults. The eastern spot-billed duck is darker and browner; its body plumage is more similar to the Pacific black duck. It lacks the red bill spot, and has a blue speculum. Both males and females undergo a complete post-breeding moult, dropping all their wing feathers simultaneously. ==Distribution ==

This duck is a resident throughout Pakistan and India in freshwater wetlands. They tend to avoid very large patches of open water and prefer medium-sized wetlands with vegetation cover. Some individuals may however migrate as a bird ringed at Bharatpur in Rajasthan on 5 December 1969 was recovered near Novosibirsk in August 1970. It is quite gregarious outside the breeding season and forms small flocks. The northernmost populations have expanded their range northwards by more than 500 km since the early 20th century, possibly in reaction to global warming.{{Cite journal| doi = 10.1642/0004-8038(2004)121[0930:AHASGF]2.0.CO;2| issn = 0004-8038 | title = Asymmetric hybridization and sex-biased gene flow between eastern Spot-billed Ducks (Anas zonorhyncha) and Mallards (A. platyrhynchos) in the Russian far east| journal = The Auk| year = 2004| s2cid = 17470882 ==Biology==

It is a bird of freshwater lakes and marshes in fairly open country and feeds by dabbling for plant food mainly in the evening or at night. The breeding season varies with rainfall and water condition but is July to September in northern India and November to December in southern India. Multiple broods may be raised. It nests on the ground hidden in vegetation near water, and lays 8-14 eggs. Nests have sometimes been seen on tree branches covered by creepers. Incubation begins after the last egg is laid (allowing the chicks to hatch simultaneously) and the young hatch after about 24 days. The chicks are black with a yellow back and resemble those of mallards but with a wider eyestripe. Indian spot-billed ducks feed on plants, including crops such as rice, as well as invertebrates including snails. Through snails such as Lymnaea luteola, they also get infected by cercarian trematodes such as Echinoparyphium bagulai. Adult trematodes emerge from the duck after about 21 days. Other trematodes recorded in the species include Psilochasmus oxyurus while helminths include Opisthorchis obsequens, Notocotylus babai, N. linearis, Echinoparyphium clerci, Amidostomum skrjabini, and Hymenolepis wardlei. They are seen isolated from other species and usually in pairs or small groups and when disturbed they can take off easily and nearly vertically from the water. They were hunted extensively in British India, noted for their excellent taste. When shot at, especially when in moult, they are known to dive and remain underwater to evade capture. A local name for it was "gheret-pai" or "garam-pai". In southern India, a method of hunting involved using floating bundles of rushes on which the hunters lay in wait. Natural predators of the ducks include birds of prey and terrestrial predators including pythons and otters. Indian spot-billed duck in flight near Rohti Chhana, Patiala district.jpg|In flight with distinctive green speculum Dabbling Spot billed Ducks 01.jpg|Pair up-ending to feed Indian Spot-billed Duck with Ducklings.jpg|With ducklings Indian Spot-billed Duck.jpg|In Agrahara Lake Bangalore Indian Spot-billed duck.jpg|Indian Spotbilled duck in Kaziranga National Park Anas zonorhyncha - Kanagawa - 2025 Feb 20.ogv|Feeding in Japan ==References==