The Shelducks, genus Tadorna, are a group of large birds in the
Tadorninae subfamily of the
Anatidae, the biological
family that includes the
ducks and most duck-like waterfowl such as the
geese and
swans. The shelducks are a group of larger often semi-terrestrial waterfowl, which can be seen as intermediate between geese (Anserinae) and ducks. They are mid-sized (some 50-60 cm)
Old World waterfowl. The sexes are colored slightly different in most species, and all have a characteristic upperwing coloration in flight: the tertiary
remiges form a green
speculum, the secondaries and primaries are black, and the coverts (forewing) are white. Their diet consists of small shore animals (
winkles,
crabs etc) as well as
grasses and other plants.
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