Yes! The mountains are actually a bit of a koala paradise thanks to their large ratio of eucalyptus trees, which are the only food choice for these cute little marsupials. In fact, the Blue Mountains have so many eucalyptus trees that that’s actually how they got their name in the first place! When the eucalyptus oil fills the atmosphere and interacts with the other elements in the air, it creates mystifying rays of blue light that coat the mountains.