Hydra's Contraction Pattern (IMAGE) Kiel University Caption The typical contraction pattern of the freshwater polyp Hydra: contraction and relaxation of the same animal over the course of three minutes. Credit Animation: Andrea Murillo-Rincon, Dr. Alexander Klimovich 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.