Most butterflies live for only a few days nor weeks. But postman butterflies live for up to 9 months because they feed on pollen as well as nectar. Pollen is rich in nutrients, especially proteins.
Inside information
Inside information A new method of testing the toxicity of pesticides
and fungicides is being investigated by an agrochemical
manufacturer. The method uses small chips called biosensors to
detect toxicity. Biosensors are usually either small cultures of an
organism's cells, or a small chip coated with fragments of genes
from an organism. The effect of chemicals on those genes or cells
is measured to determine whether the chemicals are toxic to the
organism. 13 MARCH 1999, P. 17
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