Figure 2. Shark denticles (IMAGE) Tokyo Institute of Technology Caption Denticles with varying heights and spacing reduce drag by interacting with streamwise vortices. High middle ridges push away larger vortices at low cruising speeds (2 m/s), while smaller neighboring ridges handle smaller vortices at hunting speeds (5 m/s). Credit Journal of the Royal Society Interface Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.