Seen in the Royal Botanic Gardens, Sydney last month. My birding reference, Birds of Australia, states voice as 'harsh croaks'
According to recent newsletter from Birding N.S.W., "Ibis' have been tagged for the sake of research. to improve our understanding of the Australian white ibis population in urban Sydney. We are monitoring site-fidelity, foraging movements and habitat preferences. We are also interested to know where birds move throughout Australia.
..if you see a wing-tagged or colour-banded ibis, please email your observation to: