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Length: 50-55cm. (19¾-21¾ in.)
Sexes similar, except that the male may have less or no barring on the underparts. Females average smaller.
White wing shows black primaries, and a broad green bar.
Damp upland forest clearings.
The nest is close to water where trees are present. It may be on the ground in tall grass, at the base of a tree, or in a hole in log. Sometimes it is placed fairly high, up to four meters above the ground. The nest is lined with grass and covered with a second thick lining of down. Clutch of 4-6 creamy-white to pale brown eggs are laid.
They are mainly vegetarian, feeding on leaves, stems and seed heads of grasses and sedges. On the wintering grounds, they often graze on wheat, maize, sunflower and sorghum stubble.
Male gives soft whistles and the female produces harsh cackling notes.
Partially migratory, moving north to winter in the pampas region to Buenos Aires province.
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