This is the more usual posture for a Bush Stone-curlew. These are mostly nocturnal birds and cry a soulful 'weerloooo' during the night, one starting and others joining in, building up to a crescendo, then stopping abruptly.
In the folklore of the Australian Aborigine, a bunyip is a roaring, man-eating monster that lives in lakes and swamps and billabongs, waiting in the dead of night to grab his unwary victim and drag him or her down to the bottom, where he then eats the poor wretch. Some associate the call of the Bush Stone-curlew with the bunyip.