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The Canvasback (Aythya valisineria), historically known in the United States as a Sheldrake, is a large diving duck, up to 48-60 cm long and weighing 1270g.Their breeding habitat is North American prairie wetlands. The bulky nest is built from vegetation in a marsh and lined with down. Loss of nesting habitat has caused populations to decline. Canvasbacks usually take new mates each year, pairin