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The mottled duck (Anas fulvigula) [note 1] or mottled mallard is a medium-sized species of dabbling duck. It is intermediate in appearance between the female mallard and the American black duck . It is closely related to those species , and is sometimes erroneously considered a subspecies of the former.
Male mallards also occasionally chase other male ducks of a different species, and even each other, in the same way. [103] In one documented case of "homosexual necrophilia", a male mallard copulated with another male he was chasing after the chased male died upon flying into a glass window. [103] This paper was awarded an Ig Nobel Prize in ...
Female (left) and male (right) Argiope appensa, displaying typical sexual differences in spiders, with dramatically smaller males Hammock Spiders (Pityohyphantes sp.) courting. Female left and male right. Many arachnid groups exhibit sexual dimorphism, [45] but it is most widely studied in the spiders.
The fleshy orange feet of the duck have dark webbing. [11] Both male and female American black ducks produce similar calls to their close relative, the mallard, with the female producing a loud sequence of quacks which falls in pitch. [12] In flight, the white lining of the underwings can be seen in contrast to the blackish underbody and upperside.
The female is generally lighter-colored than the male and has plain back feathers. A first-year male Hawaiian duck looks like an eclipse-plumaged male mallard. Seasonal plumage differences, individual variation, and variation between islands can make it difficult to differentiate between Hawaiian ducks, female mallards and hybrids of Hawaiian ...
This is a list of the breeds of domestic duck which have official recognition at national or international level. [1]Most breeds of duck derive from the wild mallard, Anas platyrhynchos, while a small minority are descendants of the Muscovy duck, Cairina moschata.
The Pacific black duck has declined sharply in numbers in New Zealand and several Australian islands due to competition from and hybridisation with the introduced mallard. [15] Rhymer et al. (1994) say their data "points to the eventual loss of identity of the grey duck as a separate species in New Zealand, and the subsequent dominance of a ...
Meller's duck (Anas melleri) is a species of the dabbling duck genus Anas. It is endemic to eastern Madagascar . Although a population was established on Mauritius in the mid-18th century, this is on the verge of extinction due to habitat loss and competition by feral domestic ducks . [ 2 ]