Firefly "femmes fatales" acquire defensive steroids (lucibufagins) from their firefly prey.

@article{Eisner1997FireflyF,
  title={Firefly "femmes fatales" acquire defensive steroids (lucibufagins) from their firefly prey.},
  author={Thomas W. Eisner and Michael A. Goetz and David E Hill and Scott R. Smedley and Jerrold Meinwald},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1997},
  volume={94 18},
  pages={
          9723-8
        }
}
Female fireflies of the genus Photuris, the so-called firefly "femmes fatales," prey on male fireflies of the genus Photinus. The females are able to entrap the males by faking the flash signal characteristics of the Photinus female. We found that by feeding on Photinus males, Photuris females gain more than nutrients. They also acquire defensive steroidal pyrones called lucibufagins, which are contained in Photinus but which Photuris fireflies are unable to produce on their own. Photuris… CONTINUE READING

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