The Black-necked Stork (Ephippiorhynchus asiaticus) is Australia's only stork. This species is sometimes called the Jabiru - which is actually the name of a stork species from South America.
This bird was wandering along on the side of Yellow Waters in Kakadu National Park, Northern Territory. This individual is a female - you can tell by the gold / yellow iris of the eye. This bird has a wing span approaching 2 meters, and its beak can reach 300mm. With a mass of about 4kg, it's a big bird.