The falcated duck or falcated teal (Mareca falcata) is a gadwall-sized dabbling duck from the east Palearctic (East Siberia and Mongolia to North Japan; wintering to India).
The breeding male is unmistakable. Most of the body plumage is finely vermiculated grey, with the long sickle-shaped tertials, which give this species its name, hanging off its back. The large head is dark green with a white throat, and a dark green collar and bronzed crown. The vent region is patterned in yellow, black and white. The female falcated duck is dark brown, with plumage much like a female wigeon. Its long grey bill is an aid to identification.