A very large, flightless rail of lowland swamp forests. Thick yellow bill and strong black legs. Dark brown back, buffy flanks and a pale face and chest. Flicks its wings upwards often. Somewhat similar to Rufous-tailed Bush-Hen, although New Guinea Flightless-Rail is significantly larger, not as dark and has a longer bill. Similar size to a scrubfowl, but the bill is totally different. Call, a rough, introductory “rak! rak! rak! Followed by a series of upslurred growling sounds repeated constantly.