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Blog Hunter Storms Sébastien Houle (Digswolf)
Friday, March 4, 2011
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On plumage sooty brown, black duck (Anas rubripes) is common in ponds and marshes in eastern Canada. He is the only common duck in eastern North America in which both sexes are almost identical. The male and female black ducks resemble the female Mallard, about the size and appearance. His body is however a darker brown than the Mallard and, unlike him, he has no white feathers on the edge of the tail and white wing bars so easily identifiable. The plumage of the head and neck is paler than the rest of the body, and one can notice the kite on a beautiful violet-blue speculum or mirror. In flight, it is recognized that bird contrast produced by the white underside with the rest of the body.
The color of the beak and feet to determine the age and gender. These differences had once believed that there were two sub-species of Black Duck race Northern Red-legged race and a "common "South. Banding, the process of fixing a ring of aluminum to the leg of a bird to track its movements, has demonstrated conclusively that this is not the case.
In eastern North America, about 5 per 100 wild ducks that look like the black duck are in fact hybrids resulting from crossing this species with Mallard in nature. This proportion is often much higher in some regions. Hybrids are difficult to recognize, but sometimes have features such as traces of green on the side of the head and traces of white on the edge of the mirror blue. Similarly, the Mallards have certain characteristics of black ducks, are also the result of crossing between the two species. Black Duck is indeed very probably derived from an ancestor of the Mallard
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