#17: Poison Dart Frog

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Packed into 2 inches of colorful amphibian is enough poison to kill an army of 20,000 mice. This means that with roughly 2 micrograms, or the amount that would fit on a pinhead, you could successfully stop the heart of a large animal. And to make matters worse, the poison is actually located on the surface of the skin. You seriously can't touch this.

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