Australian animals are very different than the rest of the world. I wonder if the radiation of Australia's Uranium deposits have anything to do with why animals uniquely evolved? For instance, marsupials have three vaginas and platypus are one of the only mammals that lay eggs.
If not Uranium what makes them so different?
https://list25.com/25-outrageous-kangaroo-facts-to-keep-your-mind-hopping/