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Every entry on this list is a menace. They may be cute, or iconic (actually, a few of them are pretty gross) but ?every one of them — animal, plant, insect or fish — single-handedly warp, subvert and destroy any environment they?re introduced to. Although we can?t blame them because in nearly every case they were perfectly happy in their own natural habitat until, for whatever reasons, humans took them from one place to another. So, in a way, every one of these entries is your fault.
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10. Tumbleweed
9. The Northern Snakehead
8. The Grey Squirrel
7. Japanese Knotweed
6. The Lionfish
5. The Yellow Crazy Ant
4. The Asian Mongoose
3. The Walking Cat Fish
2. Brown Tree Snake
1. The European Catfish
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