Emperor gum moth caterpillar (Opodiphthera eucalypti)

A very large caterpillar (100mm length 20mm diameter); pale green-blue with very brightly coloured (spectrum red to purple) protuberances evenly distributed over the back and sides; with tufts of white hairs; a set of 3 pairs of legs at front; 4 pairs spread to rear; 2 yellow clasping at rear; a single cream line along each side.
Eucalyptus forest - dense to very open.