SOFT-TAILED DIVING DUCKS.
Stout, heavy body. Coloured in masses. Speculum less plain or wanting. Hind toe short and broadly lobed (315-322). Feet large and webbed to the toes. Tail-feathers normal, not stiff. Thick plumage and rather short wings. Obtain their food principally by diving. Post-nuptial plumage, when the males become more or less like the females during the time that they moult their quills.
Primaries partly whitish.