A tiny, mouse-like flightless rail restricted to Inaccessible Island in the Tristan da Cunha group. The sooty adult has a brown back, a white-barred belly and flanks, and a reddish eye. Duller juvenile is paler and lacks barring. Prefers dense cover like tussock and thickets. Vocal, giving a strident trill to proclaim its territory, as well as a short “tchick” and other hard notes.