Seen roaming on foliage in flower garden, in a suburban yard (but couldn't photograph it while it was winding up and down and this way and that way on the foliage).
Found on Eucalypt. Maybe 10mm. Thought it was a shelf like fungus till I zoomed in and it started moving, like rearing up.
I used to see hundreds of these caterpillars in our paddocks at Yarra Glen growing up, and I've always wondered what they turn into!
On a red brick wall - grout lines show brick height for size reference