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A species of cactus is endemic ("native") to North America. It was introduced to Australia and soon spread across much grazing land, removing it from production. U.S. entomologists sent down a moth also found only in North America, whose larvae fed voraciously on cactus. Within a few years, the cactus population in Australia crashed to zero and both the cactus and moth were eliminated from Australia. But the same species of cactus and moth continue to coexist in North America as stable populations. The most likely explanation for the different fate in Australia is
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