Search results
Results from the WOW.Com Content Network
African black duck. The African black duck is a black duck with pronounced white marks on its back, a dark bill, and orange legs and feet. A purpish-blue speculum is often visible, especially in flight. It lives in central and southern Africa. It is also known as the black river duck, or (A. s. leucostigma) West African black duck or Ethiopian ...
Download QR code; Print/export ... move to sidebar hide. Black duck may refer to three dabbling ducks: African black duck, Anas sparsa; American black duck, Anas ...
A. African barred owlet; African black duck; African black swift; African blue tit; African broadbill; African chaffinch; African citril; African collared dove
African black duck; Aix (bird) American black duck; Anas chathamica; Anatinae; Andean crested duck; Andean duck; Australasian shoveler; ... Code of Conduct; Developers;
Bird codes, also known as banding codes or alpha codes, are four-letter abbreviations for bird names used by bird banders, ornithologists, and birdwatchers in North and Central America. The codes are written in capital letters, and look like, e.g., MODO for mourning dove .
The retention of ancestral genetic variation can be caused by incomplete lineage sorting (ILS) and introgression after secondary contact. These two factors can cause genetic variation to be shared between closely related species which is possibly why an American black duck or a Mottled duck (Anas fulvigula) may have notable white on its speculum or a Mexican duck may have flecks of green.
They are large, black-and-white, or completely black, with long wings and deeply forked tails. The males have colored inflatable throat pouches. They do not swim or walk and cannot take off from a flat surface. Having the largest wingspan-to-body-weight ratio of any bird, they are essentially aerial, able to stay aloft for more than a week.
Gulls are typically grey or white, often with black markings on the head or wings. They have stout, longish bills and webbed feet. Terns are a group of generally medium to large seabirds typically with grey or white plumage, often with black markings on the head. Most terns hunt fish by diving but some pick insects off the surface of fresh water.