14 - 15 cm. 16.4 - 29.3 g. Iris dark-brown. Bill brown to black, lower mandible yellowish at the base. Sides of head beige-brown. Crown and upperparts brown, with broad black-brown stripes. Feathers of upper-back with pale margins forming bands. Belly and flanks buffy white with broad black lines. Flight feathers black-brown with thin buff margin. Feathers that cover the wings above dark brown, with buff-white to pale brown on tip and margins. Feathers that cover the wings below white-gray. Tail feathers black-brown; central feathers with buff margins; feathers more external with white on tip. Legs yellow-pink to pale brown. Males and females are different. Male: Reproductive plumage (February-August): Eyebrow deep buff-pink. From chin to chest, the feathers are deep buff-pink. Chest with narrow and scattered black stripes. Non-reproductive plumage (September-March): Eyebrow, chin and chest beige, with occasional shades of pink. Blackish line on sides of head. Chest strongly striated. Female: Reproductive plumage (February-August): Face and throat dull pink. Upper-chest beige strongly striated. Non-reproductive plumage (September-March): Eyebrow, chin and chest beige, never pink. Blackish line on sides of head. Chest strongly striated. Juveniles have underparts and eyebrow pale buff; the dark stripe on cheek is broad; underparts strongly striated with black.