The rat kangaroo is a sub-species of kangaroo, and quite different to the kangaroo rat of North America. Found only in Australia (with some species found in New Guinea), the rat kangaroo is a marsupial, not a rodent like the kangaroo rat.
There are several species of rat kangaroos, including the Rufous-rat kangaroo (the largest of the rat kangaroo species), the musky rat kangaroo (the smallest kangaroo of all), the desert rat kangaroo, potoroo and the bettong.