Heard calling at midnight on Sportsman Creek wildlife refuge by Dr.Greg Clancy with characteristic booming call; “whoom” 20-30sec interval “whoom”. Listed as a Threatened Species in south due to habitat loss. This bird requires dense water-edge vegetation. Generally feeds at dusk and night foraging on reptiles, fish and invertebrates. During the day they roost in trees or on ground in dense reeds.
Reference ; Morcombe, M. Field Guide to Australian Birds.
Image Credit; IBC (Internet file share).