Size: L: 45 cm. Wt: Males: 350 g. Females: 400 g. Males and females are dimorphic in size, but not in plumage. This species is not seasonally dimorphic.

Adult: wings and back greyish-brown, with scalloped appearance; underparts pale greyish, streaked with brown; head with two broad, brown stripes over crown, and dark eyestripe; bill long, markedly downcurved, dark; legs long, gray

Juvenile: similar to adult, but with more white spotting on wings and back, and heavier streaking on underparts