How are wombats and koalas alike?

Like other mammals, koalas give birth to live young, they feed their young with milk, and they are warmblooded, all defining features of Mammals. Like other mammals, they breathe air using lungs rather than gills. They also have fur, and other mammals have either bare skin, fur or hair.

Koalas, specifically, are an order of mammals known as marsupialia, or marsupials. They are mammals in every sense of the Word, but they also have a pouch in which most of the development of the young joey occurs.