Caterpillar of an insect species are specialized to feed on the leaves of single host plant species, which is toxic and contain a chemical which releases cyanide when degraded. Concentration of this chemical were measured in the leaves as well as the blood, gut and faeces of the caterpillars. The chemical was found to be higher in concentration in the gut and farces of the caterpillar than in the leaves but absent in blood. The caterpillars were not seen to suffer any ill effects from feeding on the leaves but were instantly killed on artificial exposure to cyanide. This suggests that the caterpillars have evolved a mechanism to
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