Many people are worried that non-native plants and animals are invading the U.S. and preventing native species from thriving. Each year, a lot of money and time is spent trying to rid the land of these aliens - often to no avail. But, are these species present because they’re the only ones that can exist in that environment? Are some plants and animals actually helping to create a more diverse and robust ecosystem? And are some native species really native to the U.S.? Our guests offer up a different perspective on the invasive species debate.

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