These look like moth caterpillars, maybe Oecophoridae of which there are numerous species. Some of them eat dead gum leaves and shelter under bark. See http://lepidoptera.butterflyhouse.com.au/oeco/oecophoridae-cats.html .
The pairs of dark dorsal spots looks more like Pyraloidea. Can you to take them into protective custody and rear them to adults to determine the species?
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