Ibis are fully protected in all states and territories and must not be shot.
Although its all dark plumage is similar to that of many waterfowl, there is no way that the Glossy Ibis should ever be mistaken for a game species.
The long curved bill and long legs are typical of all the other Ibis species, and are very obvious in flight. When they're further away it does get harder to tell what they are. But notice the lack of any wing pattern or markings.
The Straw Necked Ibis are much larger birds with black and white plumage. Like the Glossy Ibis, they have curved bills and slow wing beats. They should be easy to distinguish from all game species.
The White Ibis is also unlike any game species, and so is the Royal Spoon Bill. Yellow Billed Spoon Bill should also be easy to identify.
Video footage of the Glossy Ibis and Straw Necked Ibis is attached below.