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Modification of Duck's Stage Model. Stephanie Rollie and Steve Duck (2006) subsequently modified the original model after a critique of stage models that appear to suppose an orderly and relatively conscious progression through the above stages. Proposing instead five phases of breakdown, Rollie and Duck added a Resurrection Phase which was ...
American black duck. The American black duck ( Anas rubripes) is a large dabbling duck in the family Anatidae. It was described by William Brewster in 1902. It is the heaviest species in the genus Anas, weighing 720–1,640 g (1.59–3.62 lb) on average and measuring 54–59 cm (21–23 in) in length with an 88–95 cm (35–37 in) wingspan.
The platypus ( Ornithorhynchus anatinus ), [3] sometimes referred to as the duck-billed platypus, [4] is a semiaquatic, egg-laying mammal endemic to eastern Australia, including Tasmania. The platypus is the sole living representative or monotypic taxon of its family Ornithorhynchidae and genus Ornithorhynchus, though a number of related ...
Breeding and life cycle Eggs of falcated duck. The clutch is 6–10 eggs. Eggs are generally laid in late May. They have their nests on the ground in thick grasses, tussocks, swamped shrubbery, or hidden in deadwood. Usually the eggs are nested near water but have also been seen in small bushes approximately 80 m (260 ft) from the water.
The Anatidae are the biological family of water birds that includes ducks, geese, and swans. The family has a cosmopolitan distribution, occurring on all the world's continents except Antarctica. These birds are adapted for swimming, floating on the water surface, and in some cases diving in at least shallow water.
The HIV-1 Rev response element (RRE) is a highly structured, ~350 nucleotide RNA segment present in the Env coding region of unspliced and partially spliced viral mRNAs.In the presence of the HIV-1 accessory protein Rev, HIV-1 mRNAs that contain the RRE can be exported from the nucleus to the cytoplasm for downstream events such as translation and virion packaging.
The canvasback has a distinctive wedge-shaped head and long graceful neck. The adult male (drake) has a black bill, a chestnut red head and neck, a black breast, a grayish back, black rump, and a blackish brown tail. The drake's sides, back, and belly are white with fine vermiculation resembling the weave of a canvas, which gave rise to the ...
The domestic duck ( Anas platyrhynchos domesticus) is a subspecies of mallard that has been domesticated and raised for meat and eggs. A few are kept for show, as pets, or for their ornamental value. Almost all varieties of domesticated ducks, apart from the domestic Muscovy duck ( Cairina moschata ), are descended from the mallard, which was ...