Square Poo

Question: I was at Wilsons Promontory last week and I saw several piles of distinctly cube-shaped poo. There were 4-5 “units” in each pile and each unit was about the size and shape of a large ice cube. Each pile was deposited on a little mound of soil; it was almost as if the depositor had placed them there in the hope that they’d be noticed. What sort of animal does square poo?
Square Poo