Sure butcherbirds and currawongs, given a chance, will kill birds in aviaries and drag the bodies through the wires if possible but I suspect, with losing a foot or toes the culprit is much more likely to be other parrots sharing the aviary (if indeed there were).
Philip
Re: wild bird doing nasty things to aviary birds, when my sister and husband lived in Balmain they had several cockatoos (Major Mitchell and Little Corella) in large cages on the front verandah. House Sparrows were attracted to the scattered seeds and used to put their heads through the wire, whereupon a cockatoo would quickly nip the head off. Can’t remember if they ate the heads but the decapitated bodies were outside, enjoyed by the dogs.
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