Swamp Grass Babbler

Adults are olive-grey above, slightly warmer on the back of the neck and upper back but less distinctly collared than the rufous-vented grass babbler, with greyish-white underparts, greyer on the flanks and perhaps slightly streaked, and faintly tawny off-white wing linings. Some authorities consider it a subspecies of the rufous-vented grass babbler (Wikipedia, general species account).

It moults into adult head and body plumage, keeping its flight feathers, about four to six weeks after fledging. The calls include a wheezy feez and a quiet, very rapid nasal rattle, and the song is a liquid, loud warble about 4 seconds long, comparable to a dunnock's. Like the rufous-vented grass babbler it skulks low in grass tussocks, hopping and threading its way through, often in small groups, feeding on insects (Wikipedia, general species account).