Harlequin Bug (stink bug)

Harlequin bug, jewel-like with colours of bright metallic greens, blues on red.
Their main native food plant is the Beach Hibiscus (or Cotton Tree).

This blip apparently is a female (the big red bug) lay clusters of eggs around twigs and guard them until they hatch. If disturbed, it emit a pungent odour. Phew!
(so don't be tempted to poke them with a stick :)
ref: internet site on AusBugs!!