Tasmania is a natural sanctuary for the plants and animals that migrated down the land bridge connecting it to the rest of Australia, which submerged 13,000 years ago. With no predatory carnivores like the dingo and the European red fox, Tasmania is now the only place in Australia where some species of marsupials, reptiles, amphibians and birds are still found. Yet the rogue introduction of foxes may turn this island sanctuary into a trap. TASMANIA - SANCTUARY OR TRAP? looks at what will it cost, in environmental terms, if foxes were to become established and what natural defenses can be mobilised against them.