The Brown Thornbill lives in shrubs and forest understory in eastern and southeastern Australia and feeds mainly on insects.
Its upperparts are olive-brown to gray, with a reddish scaly forehead and rufous rump. The throat and chest are off-white with dark streaks, the tail has pale tips, and the eye is red.
It feeds mainly on insects, often in pairs, and is reported to hold a territory for a long time. It searches among dense shrubs and the forest understory.
An extinction-risk assessment has not been added yet.