In pictures: The over-harvesting of amphibians
Rough trip

In western Brazil and eastern Peru, frogs of the Phyllomedusa genus are used as a hallucinogen.

Chemicals secreted by the frog's skin and introduced into a human's bloodstream are said to lead initially to vomiting and incontinence, then deep sleep, and finally a period of enhanced sensitivity in sight and hearing. Image: E. Lavilla

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