Could be moth or butterfly larva. Meadow argus is our commonest butterfly and it does look a bit like pictures of those. About 60 mm long and found eating grevillea.
I think I am pretty safe in confirming this. We've seen the larvae quite a bit. Nice photos of the adult here: https://atlasoflife.naturemapr.org/sightings/4185785. Alas, we have yet to see one of them.
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