The sexes look alike, with olive-brown upperparts, grayish-white underparts, and a rounded tail. It breeds on islands near Japan, Korea, and the Russian Far East, then winters farther south.
The sexes are similar. Upperparts are olive-brown, the underparts grayish-white, and the rounded olive tail has white tips except on the central feathers.
It uses Sasa or Miscanthus grassland during breeding, as well as low evergreen woodland on some islands. Birds arrive in Japan from late April into May and move south for winter.
An extinction-risk assessment has not been added yet.