In the next sub-family come the domestic Ducks and most of the wild Ducks of Australia. This group is often referred to as the "Freshwater or River Ducks." First come two kinds of Whistling Ducks--so called on account of their whistling note uttered while flying. These are rare Ducks, one of which is found as far as India; the other is occasionally seen in New Zealand, as well as in Australia. The Sheldrake, or Shieldrake (Mountain Duck) is the largest Australian Duck, and one of the most handsome of the sub-family. It is nowhere very plentiful, though one or more pairs appear in most suitable localities. As it is unfit for the table, it should be spared as an ornament to the landscape. The Black Duck is very similar to the common wild Duck (Mallard) of England. Our Black Duck does not change color with the season, nor is the male different in color from the female. The Australian Teal is closely similar to the Teal of Europe. It is a grass feeder, and is a good table bird. The female is very different from the male. It is impossible to distinguish the male Gray Teal from the female Teal when in the free state. Mr. Keartland (ex-President of the Field Naturalist Club, and ornithologist to the Horn and Calvert exploring expeditions) has shown that there is a big difference in weight. The male of the smaller Gray Teal is not brightly colored like the male Chestnut-breasted Teal. The remarkable Shoveller comes next. It is closely similar to the English Shoveller. Strange that this name was first used for the Spoonbill. The Shovellers are found the world over. The males are very brightly colored in the nesting season. Unlike most other birds, Swans and Ducks lose the whole of their wing feathers at once when moulting, so that for a short time they cannot fly. As a protection, the gaudy ones acquire a quiet, inconspicuous coloration for a time, so that the male is said to get an "eclipse plumage." Many other birds get a bright dress for the breeding season only, but the male Duck wears his bright dress for the whole year, except in the moulting period. It is then "eclipsed," with the corresponding advantage that he is protected from his many enemies at a time when he is most helpless. The remarkable Pink-eared Duck has no close relative. It has a small pink spot between the eye and ear, and so is called pink-eyed or pink-eared. It is found only in Australia. The female is similar in color to the male. The name Wigeon, or Widgeon, sometimes applied to this Duck, properly belongs to another of the fresh-water Ducks which is not found in Australia. Hence, this name should not be used for our bird. Another peculiar Australian Duck is the Freckled Duck. It is a very rare bird. One taken on the ornithologists' excursion to Eyre Peninsula was considered a prize. So far as is known, it does not change color with the season, nor has the male or female the usual bright metallic patch seen on the wing of a Duck.