10 Invasive Species that Changed the World Forever

Cane Toad

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invasive cane toad photo
2 of 11

Setting cane toads loose in Australia seemed like a good idea at the time: The amphibians were supposed to help combat pests in sugarcane fields, and they did.

But they didn't stop there: They became a threat to all of the native species in their paths, affecting the entire country's biodiversity as they moved west toward the national parks region.

The country is now working on a $7 million, 15-year plan to reign them in.

Photo: Sam Fraser-Smith/Creative Commons