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Liam Hourihan inspects a model of a Helicoprion - a strange toothed shark - whose vertical teeth looks like a circular saw and which were thought to have been used to grasp its prey, at the opening of the Melbourne Museum's exhibition, a journey through 600 millions years of Victoria's life and landscapes, in Melbourne on July 1, 2010. The exhibition tells the story of the Australian state's evolution, of land geology and species, beginning hundreds of millions of years ago when Australia was part of a super-continent and how evolution has shaped Victoria as we know today. AFP PHOTO/William WEST (Photo credit should read WILLIAM WEST/AFP via Getty Images)