It is speculated that beyond 30 million years ago, koalas only had their ancestors roaming freely at the Australian continent. At that time koalas were literally not koalas but some other animal which had a core preference to feed from grasslands as well as trees. In fact; these ancestors were the ones which separated from the wombat ancestors about 42 million years ago.
The koala ancestors which separated from wombats are classified as Diprotodonta. Diprotodonts were huge animals with two big front teeth and they weighed almost two tons.
Therefore; in between 30 million years and 42 million years ago, koalas were in fact Diprotodonts with a huge appetite. These arguments indicate that koalas were living 42 million years ago as Diprotodonts. Today; wombats are the only closest relatives of koalas across the continent of Australia. Furthermore; it was the common ancestor of koalas and wombats which entered the Australian continent about 55 million years ago from the South America.
Therefore; this ancestor would have played a fundamental role to derive marsupials at the Australian continent too. In the Qld Government announced a six month open season on Koalas, and in that period alone, 1 million Koalas were killed. Although the season officially remained closed until , when the season re-opened, over , were slaughtered in just over 1 month. However, no such laws were brought in to protect the gum trees upon which Koalas rely for their food and shelter. Koala Map sightings and habitat.
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