Size: L: 22 cm. Wt: 75 g. Males and females are similar, but females slightly duller. This species is somewhat seasonally dimorphic, retaining a similar, but slightly duller plumage in winter than in summer.
Adult: upperparts brownish-olive, with coarse black, and fine white, streaks; head grayish, with dark crown and nape, and black or dusky face and chin; sides of breast grey; throat and centre of breast black; flanks and belly barred brown and whitish; bill yellow, with dark tip; legs greenish
Juvenile: upperparts similar to adult; head brownish, with dark crown and nape, and dusky face; chin whitish; breast pale brown; flanks and belly barred brown and whitish, and belly with whitish central spot; bill greenish; legs dark greenish
Nestling: precocial and downy; down thick, short, black; bill and legs grey