71 cm. 550 g. Eyes orange to reddish-brown. Bill blackish with the base green-grayish. Neck and bill very long, legs relatively short. Head black with the long nape feathers, grey-bluish in color. Neck brown with a chestnut and white stripe along it front part. Breast with a silver filament like patch. Brown belly. All the dorsal parts dark green. Yellow legs. Male and Females similar, except during breeding. Males: When breeding feathers of the back are long and grey-bluish. Face reddish. Female: When breeding feathers of the back are long and grey-bluish. Face greenish. Immature have face and neck bright brown, and back blackish; chest is stripped light and dark brown getting whitish on belly.