A tiny, warbler-shaped songbird confined to the eastern Lesser Sundas. Upperparts gray-brown; underparts clean, unmarked white. Note subtle white mark between bill and eye, and beady-eyed appearance. Juveniles washed yellow below. Inhabits forest, edge, mangroves, and scrub from coast to mountains. Sits high in the understory, singly or in pairs. Unmistakable, as the only tiny gray-and-white warbler-like bird in range. Warbling song comprises a series of high-pitched, descending whistled phrases such as “pee-pee-ooo-ooo-pee-ooo-ooo”. Calls often and for prolonged periods.