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Caterpillars with fungus being dried in basket (© Gabbro/Alamy)
caterpillar fungus viagra
caterpillar fungus viagra

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A parasitic fungus that grows from the tops of the caterpillars it kills is fast becoming a multi-million-dollar industry for some Tibetan villagers (what is the fungus said to be worth more than?). The strange fungus (video: watch what it does to another insect) is often called "Indian Viagra" and besides supposedly curing impotency, it is also used as a kind of performance-enhancing drug for athletes (what negative side effect has the fungus caused in one case?).
 
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