The New Guinea bockadam or dog-faced water snake, Cerberus rynchops, is a species of a colubrid snake found in coastal waters of Asia and Australia. C. rynchops is commonly found in mangroves, mudflats, streams, ponds, tidal pools, on algae patches, and has even been found burrowing into the mud. C. rynchops is rear-fanged and is mildly venomous. An aquatic and nocturnal snake, it feeds mainly on fish and is known to consume eels.