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Exotic species are constantly being introduced to new locations around the world, and Canada is certainly no exception. In many cases, the introduced species die out, leaving no permanent impact. Other times, though, they can grow out of control and directly interfere with native ecosystems, perhaps even dominating them and driving native species to extinction. A few of the better-known examples of successful exotic species in Canada include Dutch elm disease, purple loosestrife, zebra mussels, sea lampreys and starlings. The number of exotic plant species is staggering; it is estimated that 800 of the 5 000 plant species in Canada are exotic introductions and successful enough to maintain populations in the wild!
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