Many works like to feature exotic animals, and nothing is a cooler way to introduce a weird beast than by using it for transportation. One unusual class of mammals with natural potential for transport are marsupials - after all, they come with their own pockets. And every so often, a character gets the bright idea of using that potential, and climbs into the pouch of a fast-moving pouched creature, typically a kangaroo. A few short hops later, character is safely at their destination, ready to resume the plot. A Sub-Trope of Kangaroos Represent Australia.