Eating something? Wouldn't let go. In this state about 20mm long.
It looks like there are at least three species of this genus in Australia but there are only two named species so I will abstain from guessing...
6 on the one tree in the park, all very small and 2 ball-shaped eggsacs nearby.
Looks like TD and KE have it nailed... https://sites.google.com/site/insectsoftasmaniahemiptera/sternorrhyncha/psyllidae-lerps-jumping-plant-lice/genus-creiis/creiis-longipennis
Big frog
A cluster of fine filamentous structures about 10mm long hanging from the underside of a fallen rotting log. At the ends of these filaments were clusters of rounded dark purplish clusters. The clusters were covered with a whitish substance that had a slimy look. Beside this cluster was a dense growth of stiff thread-like hairs.
Spotted in the Dandenong Ranges.
Solitary bat under bark of dead Acacia.
Male drying wings on the bank of Scrubby Creek.
Severe mite infestation.