t long last the mystery has been solved. For years, scientists have puzzled over why the mammals produce cube shaped poop. Now they say they have uncovered how and why wombats produce cube-shaped poop – the only known species to do so. The Australian marsupial can pass up to 100 deposits of poop a night and they use the piles to mark territory. The shape helps it stop rolling away. Despite having round anuses like other mammals, wombats do not produce round pellets, tubular coils or messy piles. Researchers have revealed that the varied elasticity of the intestines help to sculpt the poop into cubes.