The Outback interior of the Australian continent is very dry. Almost two-thirds of its area is desert or dry grassland. It is a harsh environment for living things, but not an impossible one. Many animals exist here but the only large one is the gwanna. It is the last survivor of the rhabdodontids, as well as the last of the non-hadrosauroid iguanodonts. These dinosaurs (iguanodonts in general dating back to the Middle Jurassic) are closely related to the basal ornithopods, of which are now found almost all over the world, but the non-hadrosauroid iguanodonts tended to be much larger and had more cheek teeth. On all the other continents of the world the non-hadrosauroid iguanodonts were eventually replaced by the more versatile hadrosaurs, but in Australia they survived in isolation as the
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