Australian Darter - Anhinga melanogaster
Because of its long and slender neck, the Australasian Darter is sometimes called the snakebird. Usually inhabiting freshwater wetlands, darters swim with their bodies submerged beneath the water’s surface, with only the sinuous neck protruding above the water, enhancing its serpentine qualities. Darters forage by diving to depths of about 60 centimetres and impaling fish with its sharp, spear-like beak. Small fish are swallowed underwater, but larger ones are brought to the surface, where they are flicked off the bill (sometimes into the air) and then swallowed head-first.
(Text Source: BirdLife Australia)