Thanks @ibaird I'm trying to include underside shots whenever possible as it adds to the overall information about the moths and hopefully sometimes helps with their identification.
Whilst it looks most like a Freshwater Snake or Keelback (Tropidonophis mairii subsp. mairii), as Atticus suggests, it's critical to eliminate the possibility of it being a Rough-scaled Snake (Tropidechis carinatus), which is dangerously venomous, looks superficially similar, and lives in similar habitats, and both species are found in this part of the world. The most definitive ways to distinguish between these two species is that the harmless Freshwater Snake or Keel-back has a loreal scale between the nasal and preocular scale and divided anal and sub-caudal scales, whereas the venomous Rough-scaled Snake lacks a loreal scale and has single anal and subcaudal scales.
Looking at distribution on ALA and also the distribution of E. fastigata in 'Field guide to Eucalypts, Vol 1. Brooker & Kleinig, 1999, it seems there is an association between these two species within the structure of brown barrel forests......a nicely surprising and significant find!