Size: L: 60 cm. Wt: 500 g. Males and females similar. This species is seasonally dimorphic.

Breeding Adult: entire body plumage chestnut, glossed with green or purple on head and upperparts; bill brownish; legs grayish with red joints

Winter Adult: head and underparts brown, flecked with whitish-grey; upperparts mixed chestnut and glossy green; bill and legs as in breeding adult

1st Fall/Juvenile: head and underparts light brown, with head and neck heavily flecked and streaked with buff; upperparts dark olive, with dark green primaries and secondaries; bill pale brownish; legs greyish, with no red on joints