The term 'Eucalyptus Muncher' is a reference to the KOALA, an Australian marsupial that feeds almost exclusively on eucalyptus leaves. The crossword solutions for this term are 'KOALA' (5 letters) and 'koalabear' (9 letters). Koalas are known for their large, round ears, fluffy fur, and distinctive black nose. They are also one of the most iconic animals in Australia, and are often seen in cartoons and other media.