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The only ducks which are similar are the greater scaup and lesser scaup, but these species have no tuft and a different call. The tufted duck is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds applies. [11] Refer to the following table for measurements of the tufted duck: [12]
A tufted duck in flight showing the white wingbar. The species are plump, compact, medium-sized ducks ranging from 37–61 cm long, 60–84 cm wingspan, and weighing 410–1600 g, with canvasback the largest, and ring-necked duck and ferruginous duck marginally the smallest.
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Grebes (/ ˈ ɡ r iː b z /) are aquatic diving birds in the order Podicipediformes (/ ˌ p ɒ d ɪ s ɪ ˈ p ɛ d ɪ f ɔːr m iː z /). [1] Grebes are widely distributed freshwater birds, with some species also found in marine habitats during migration and winter.
Order: Anseriformes Family: Anatidae The family Anatidae includes the ducks and most duck-like waterfowl, such as geese and swans.These birds are adapted to an aquatic existence with webbed feet, bills that are flattened to a greater or lesser extent, and feathers that are excellent at shedding water due to special oils.
The greater scaup (Aythya marila), just scaup in Europe or, colloquially, "bluebill" in North America, [3] is a mid-sized diving duck, larger than the closely related lesser scaup and tufted duck. It spends the summer months breeding in Iceland, east across Scandinavia, northern Russia and Siberia, Alaska, and northern Canada.
This group is then sister to the monophyletic group consisting of the white-eyes (hardhead, Madagascar pochard, and the sister species ferruginous duck and baer's pochard) and scaups (New Zealand scaup, ring-necked duck, tufted duck, greater scaup, lesser scaup). [5]