A barrier to stop the invasion of poisonous toads will be built in Australia for $28 million. This will be an artificially shaped barrier in an area of 7,500 square meters. km. According to local media, poison ivy toads are now spreading about 100km from Broome and 2200km north of Perth. Scientists hope this large-scale barrier will stop their further progress. They say these invasive amphibians have already wiped out millions of native Australian animals - from rare snakes and large lizards to freshwater crocodiles.