 Following the arrival of Europeans in Australia, the term "possum" was borrowed to describe distantly related Australian marsupials of the suborder Phalangeriformes, which are more closely related to other Australian marsupials, such as kangaroos.They similarly have 'Didelphimorphia', two ("di") wombs ("delphus"), the second being a non-bilateral marsupial womb (nursing-pouch).Didelphimorphs are small to medium-sized marsupials that grow to the size of a house cat.