Adult length: 18 in. (44 – 48 cm); adult weight: 13.4 – 14.8 oz.(316 – 502 g); coloration: head, neck and underparts (including tail, tail-coverts, rump) pale grey with fine brown-black speckling on head and neck, larger markings on body; slight crest on nape; upperparts dark brown with reddish buff feather edges; wings dark grey-brown, darker primaries, metallic green/black secondaries with white tips and broad white tips to greater coverts: speculum green with white borders.