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I'd say it was an odd-ball Straw-necked Ibis (Threskiornis spinicollis): juvenile with leucism. The head is still feathered, so it's a juvenile. Possibly a cross with a Th. molucca? Whatever, it's unusual.

Juvenile cuckoo being provisioned by Red-backed Fairywrens. Second photo shows the poor fairywren being briefly pinned by the cuckoo, just after delivering food - part of the typical BRCU post-feeding lunge manoeuvre.

I've recorded this behaviour in a couple of other cuckoo species - see here for Pacific Koel vs Noisy Friarbird host https://www.inaturalist.org/observations/143343544

This bird looks more "pure" grey than any I've seen for a while. The photos also show how the colour of the speculum changes with the angle of light. The mallard speculum also shows this purple colour sometimes, but when the angle of light changes, the true colour can be seen - blue for mallard, or in this case green for grey duck.