<em>Hymenoepimecis veranii</em> Attacking <em>Araneus omnicolor</em> (IMAGE) Smithsonian Tropical Research Institute Caption A wasp getting ready to attack a spider. Researchers think that it will then use a hormone called ecdysone to change the spider's behavior so that it spins a special kind of web. Credit Marcelo O. Gonzaga Usage Restrictions Credit: Marcelo O. Gonzaga License Licensed content 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.