This is not a quoll but it is a dasyuromorph. This is a brush-tailed mulgara.

For a while they were in the same enclosure as the red-tailed phascogales were, without any signage to that effect, but clearly these were not phascogales. They were stocky, their tails were little stumpy fluffy affairs, and they stayed on the ground while the phascogales bounded through the trees as phascogales do. A quick Twitter exchange with @PerthZoo put the mystery to bed: they’re brush-tailed mulgaras. Mystery solved.

Of course nothing stops visitors from calling everything in that enclosure “mice” – even the dibbler and the dunnarts get called mice. It’s true that many carnivorous marsupials do look like mice if you’re not paying attention – it’s a neat bit of convergent evolution – but oddly enough, human beings are far more closely related to mice than carnivorous marsupials are.