Photo: goosmurf / Creative Commons Invasive species have a bad reputation — from plant-choking vines to nest-usurping birds, they’re often rightly blamed for crowding out native flora and fauna and altering the environment they invade. But that’s nothing, compared to the 10 species on this list: They are so aggressive, they’ve actually changed the world as we know it.
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10 Invasive Species that Changed the World Forever (Slideshow)