These little dudes, feed on a variety of vegetation including native and exotic garden varieties. Pairs are often encountered where they are joined at the tail, the female dictating the direction that they walk.
The Witjuti grub is not just one such grub, they belong to many species. Some turn into Beetles others into moths like this one from the Endoxyla family. These moths are up to 3 inches in length and can be as thick as a man's thumb.