sentences:  The invisible rail is different from the Calayan rail, "Gallirallus calayanensis", in that it is larger and lacks the barred plumage of that species; there is no overlap between the ranges of the two species.The call is a low drumming, accompanied by a "tuk, tuk, tuk" made with the wings.The nature of the vocalisation led to a local legend that the sound is made by the bird beating on a hollow tree or branch with its feet.