Passionvine Butterfly in Panama (image) Smithsonian Tropical Research Institute Share Print E-Mail Caption This is a passionvine butterfly (Heliconius erato demophoon) feeding on a Psychotria flower in the wild in Panama. The cortex gene controls the yellow bar on the hind-wing. Credit Chris Jiggins Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.