Curiosity killed the cat

1. I am curious about why Australia has certain animals that you can not find around our area.
2. I have been in many english classes in the past, each having me write all different kinds of papers.  I have done multiple research papers before, even for classes that were'nt english class.
3.There is no actual reason for why there are animals in some areas then not in another, or I will not be able to find enough information.