Is a Koala a Native Australian Endangered Animal?

No. You will find a koala in Australia, but you will not find a koala bear in Australia, because no such creature exists. Koalas are marsupials, and are not related to bears in any way.

There are many more native animals in Australia than just the koala. Also, the koala is not Australia's native animal emblem. Australia has no official faunal emblem.