Without humans involved, it's not as unlikely as you might think. 2 examples: The Silversword plant found on Haleakala volcano in Hawaii descends from ancesto

Without humans involved, it's not as unlikely as you might think. 2 examples: The Silversword plant found on Haleakala volcano in Hawaii descends from ancestors found in California, presumably transmitted by birds carrying seeds. https://en.m.wikipedia.org/wiki/Argyroxiphium_sandwicense_subsp._macrocephalum https://en.m.wikipedia.org/wiki/Argyroxiphium_sandwicense_su... Several separate groups of primates that inadvertently rafted to South America on floating storm debris: https://www.cnn.com/2020/04/09/world/prehistoric-monkeys-crossed-atlantic-scn/index.html https://www.cnn.com/2020/04/09/world/prehistoric-monkeys-cro...