Gum trees (eucalypts) are the tree most commonly associated with Australia. They are found in areas from sub-alpine to wet coastal forests, through to temperate woodlands and the dry inland areas. The Greater Blue Mountains has the most diverse range of eucalypt species on earth. In fact, the Blue Mountains gets its name from the blue shimmer which rises into the air from the oil from the trees. In the Australian Alps, striking silver and red snow gums stand out amongst the snow-filled landscape. In South Australia’s Flinders Ranges ancient river red gums live in the dry creek beds. Koalas feed exclusively on certain species of eucalypts.