Later addition: If you'd like to see one close-up photo, taken in February this year, at the eating area, check this post, a few pics down. Noted then as Sacred Ibis, apparently one and the same.
This ibis was on its own, and clearly identifiable with banding and wing-tagging. According to the RBG website, the aim is to monitor ibis' movements, breeding and habitat preferences. Observations have been received from across the Sydney region and as far away as Shepparton (Vic), Coffs Harbour (N.S.W.), Brisbane and Townsville (Qld).
Sharing with Wild Bird Wednesday