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Examples of the damages caused by these so-called "invasive species" are seemingly as endless as the amount of battles waged against them. But are all non-native species bad? Biologist Mark Davis says no. Davis, a professor from Macalester College in St. Paul, Minnesota, believes it's time to raise the white flag against non-native species. Most non-native species, he said, are harmless -- or even helpful. In a letter published in the journal Nature this past June, Davis and 18 other ecologists argued that these destructive invasive species -- or those non-native species that cause ecological or economic harm -- are only a tiny subset of non-native species, and that this tiny fraction has basically given all new arrivals a bad name.