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Male: 64cm. White head and neck, white mantle, chest, abdomen and flanks with wide black lines, dark grey back, scapulars and primaries, white secondaries greater coverts on upperside producing a dark green speculum, grey central tail feathers , white laterals, black bill and legs.
White phase: Head, neck and chest white.
Female: 60cm. Bright red and neck, rufous mantle and chest with black lines, white abdomen and under flanks with wide black lines, black back and upper tail coverts, black bill, yellow legs, wings almost identical with male.
There are two subspecies:
Grassy areas and meadows below the tree line to sea level; in the southern areas on Patagonian steppe.
The diet includes grass stems, leaves and seeds.
Partly migratory, both north-south and elevational.
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