Antechinus In Australia, there are three main rodent pests that cause the most problems – the roof/black rat, the Norway/brown rat and the house mouse They carry fleas and disease as well as damaging property and contaminating food Fast on their feet it's not always easy to tell the three bad guys from protected native marsupials, such as aMuch different Look at the below photos You can see that a house mouse turd is like a small grain of rice, even smaller than that, often with pointy ends But a rat pellet is way bigger, much fatter, with rounded endsDifference between mouse and rat Rat Vs Mousecomparison between rat and mouseMouse rat differencesMice are smaller in size, with body weight around 30 gram Key Differences Between Wild Rats And Pet Rats Legacy Rodent Control How to tell the difference between a baby mouse and a baby rat