The island continent of Australia is known for its bizarre, colourful and often unique wildlife, from the marsupials and egg-laying mammals to the. sea creatures of the Great Barrier Reef. Western Australia is particularly noted for its wildflowers, with more than 2,000 native species including the official state flower, the kangaroo paw (above). In ANatural History of Australia (Academic Press, $44.95), Tim M. Berra sets out to explain how the flora and fauna have been shaped by the isolation and aridity of the continent. The book is aimed at the interested visitor, incorporating a geography of Australia and useful information for the traveller.