Toads on the Japanese island of Ishima seem to be losing their evolutionary battle with snakes. Most snakes, and indeed most other animals, avoid eating toads because of the toxins in their skin. [Rhabdophis tigrinus snakes](http://www.answers.com/main/ntquery?s=Rhabdophis+tigrinus&gwp=13 “Answers.com Article”), however, not only tolerate the toxins, they store the chemicals for their own defensive arsenal.

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