Wombats look soft, but underneath their fur they are built like tanks. They have short, powerful legs and very strong claws. A wombat can dig a tunnel system - called a warren - that stretches for 30 metres or more. Inside it is cool, safe and just the right temperature, even when the Outback is roasting hot.
Their pouch is unusual: it faces backwards. That sounds strange until you remember that wombat mums dig all day. A forward-facing pouch would fill up with soil. A backwards one keeps the baby clean and lets it peek out at the world behind its mum.
And now the big one. Wombats are the only animal on Earth whose poo comes out in cubes - little square nuggets, like dice. Scientists think they shape it as it travels through the wombat's long gut. Wombats then stack their cubes on top of rocks or logs to leave messages for other wombats. Even nature has post-it notes.
Despite looking sleepy, a wombat can run at 40 km/h if it has to, and it can charge a danger straight on. The bony plate on its bottom is so tough it acts like a built-in shield. Wombats are usually peaceful, and sometimes friendly enough that, in some Australian sanctuaries, they wander past visitors like a small, very round dog.