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" ... In fact, the Eumaeus look and behave so differently from the other hairstreaks, that scientists have argued over whether they are actually hairstreaks after all. Researchers also believe that Eumaeus butterflies much have become tolerant to cycasin a very long time ago, since cycad plants are so ancient. In other words, at some point Eumaeus caterpillars started eating cycads and then evolved their bright colors and care-free behavior. ... "