A medium-sized creeping bird of montane forest. Mainly a dull, gray-brown color with pale flecks on the flanks, a paler throat. Female has a rufous moustache stripe. The only treecreeper on New Guinea. Climbs up a trunk, then flies down to the base of another trunk. Sometimes followed by a fantail. The only other similar colored birds with this behaviour are the sittellas, which are distinctively smaller and most have a streaked back. Call, a level series of piping notes which increase in volume.