Yes now you say that I recognise the old Maritime service building in the background now. They do make easy subjects to start on practicing birds in flight shots as they fly pretty much straight with slow wing beats. But yes you can't walk I Sydney with out coming across these these days.
You don't see so many of their prettier cousins the Straw-Necked Ibis, we get a few of these about down here as well. They have amazing iridescent wing feathers.