Our national symbols, featured in the Australian coat of arms are found throughout the continent in large numbers. Australia's isolation for more than 55 million years has created a unique sanctuary of animals and plants found nowhere else in the world. Australia's marsupials did not have to compete with highly developed mammals and there are still over 100 species which flourish in ideal conditions. Take our cute koala for instance, sleeping peacefully on a branch high above the ground in a gum-tree with the young holding itself tight to mum's back. Keep your eyes wide open, they're hard to see but can be spotted in national parks and forests along the east coast. Wildlife sanctuaries let you observe them from close range and some even allow visitors into the enclosure. Australia hosts a really interesting animal group, the monotremes, egg laying mammals, that are often referred to as living fossils, like the platypus - a river dwelling little animal with duck bill and an agile furry body resembling an otter. Another representative of this group is the echidna or spiny anteater. While visiting a zoo don't forget to observe the wombat, a large, grazing, burrowing marsupial. Essentially nocturnal, wombats have been in Australia for 15 million years and are found in many parts of Australia. The Tasmanian Devil, a carnivorous marsupial is a fascinating animal. Now only found in the wild in Tasmania, the nocturnal Tassie Devil is basically a scavenger, with a loud screech and powerful jaws. There are 520 lizard species in Australia that range from small squeaking geckos to the spectacular frill-necked lizard and the swift moving goanna that can reach a size of 2m (6.5ft). Whales migrate from Antarctica during winter to warmer waters off Australia. The mighty humpback travels along the east coast while the southern right whales frequent the south and the western coast, bearing up and plunging into water again, playing and frolicking. The Great Barrier Reef along the east coast off Queensland is the longest and most complex living coral system in the world and provides a habitat for a wide range of marine animals. Another area noted for its prolific wildlife is Kakadu National Park in the Northern Territory - enjoy the sight of waterbirds, crocodiles, wild buffaloes or go fishing for the prized barramundi. Discovering Australia's birds is one of the delights of visiting Down Under, with more than 750 species of birds recorded, 300 of which are found nowhere else in the world.