Australasian realm
Almost all its native mammals (except the two monotremes) are marsupials. The indisputable remains of Australian placental mammals started from the Miocene, when Australia moved closer to Indonesia. After 15 million years ago (mya) bats appeared in the fossil record, and after 5-10 mya rodents did, and 1 mya rats arrived. This information is based on the fossil record. Several thousand years ago, man brought the dingo, and 200 years ago many more species. This information applies to Australia. The fauna of New Zealand, and the Pacific islands shows a different pattern. There the migrations from the Indomalayan ecozone mostly did not arrive.