The 2021 1 oz Australian Silver Koala. The koala is perhaps Australia's most beloved and iconic animal. The cuddly koala 'bear' is not really a bear at all, but a marsupial. Protected by law, the koala inhabits trees and feeds solely on a diet of eucalyptus (gum) leaves. The reverse design depicts a charming image of an adult koala resting on the branch of a tree and incorporates The Perth Mint's 'P' mint mark. Issued as legal tender under the Australian Currency Act 1965, the coin's obverse depicts the Ian Rank Broadley effigy of Her Majesty Queen Elizabeth II and the 2012 year-date.