Fruit Flies Duke It Out (IMAGE) North Carolina State University Caption Hyper-aggressive fruit flies box, albeit without the gloves. Aggressive flies have smaller brain portions and aren't necessarily soothed by mood-altering drugs. Credit Mark McLawhorn, NC State University Usage Restrictions None 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.