The skin of some frogs and toads contain poisons, which are among the most powerful known to humans. In South America, poison from the poison arrow frog is added to the arrow tips used by the Indians for hunting. Common toads contain poison that they exude through their skin if attacked. Dogs and cats commonly experience this poison; however they seldom suffer serious effects from it but quickly learn to avoid these amphibians. Cane toads are very large toads, which contain a drug capable of causing hallucinations if it is eaten.
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