A fairly small bird of marshes in the Trans-Fly of New Guinea. Best seen by boat. Rufous crown, rump and upper tail, whitish underparts with buffy flanks, heavily streaked orange-brown back and black wing feathers edged with white. Inquisitive and often keeps its tail cocked and wings drooped. Similar to Tawny and Little Grassbirds, but Fly River has an unstreaked, rufous crown, and is smaller than Tawny. Voice, a monotone whistle and a harsh “chat!”.