The animal which can only be found in Australia is letter E or kangaroo. Australia is known to be home to more or less than sixty species of kangaroos including the following: pademelon, wallaby, wallaroo, potorro and tree-kangaroos. The government of Australia even estimated that almost 34.3 million kangaroos are living within the areas of Australia.
It is also said that the reason why Kangaroos can only be found in Australia is because they were isolated from the rest of the world when Australia drifted away through the process of continental drift. Since there were no other means for these species to go someplace else and develop, they had nowhere else to go but to stay in the continent of Australia.