Black and Orange Beetle
Beetles on a seed-head at the Mount Lofty Botanic Gardens.
Update: According to my copy of A Field Guide to Insects in Australia, these beetles seem to be 'Seed Bugs', members of the family Lygaeidae. Bugs who feed on seed or plant sap.
Details: Nikon 105mm 1:2.8 macro, ~f/8, 1/200s, ISO 400.