A mating wingless female moth at her cocoon. The cocoon was on one of the ANBG's direction signs, Section 27. Refer to the follow-up sighting 4204211 which shows the female moth after having laid her many eggs.
If you look at http://lepidoptera.butterflyhouse.com.au/faqs/flightless.html you will see that the pretty pink-striped flightless females are Anestia species