Glen, that's so sad that the Ibis is aggressive to the other birds. I googled and your Australian White Ibis reminds me of our Wood Storks in coloration and size. We have a White Ibis here in Florida too but they just mosey about along the waters edge scuffling up the sand or they stroll through the lawn looking for morsels of food. These photos are from last year:
White Ibis ................................................... Wood Stork on my neighbors fence
