A trio of researchers, two from the University of California at Irvine, the third from the University of Michigan at Flint, has found that sea urchin sperm navigation is a natural implementation of extremum seeking. In their paper published in the journal Physical Review E, Mahmoud Abdelgalil, Haithem Taha and Yasser Aboelkassem describe how they used a navigation model and concepts from control theory to help explain how sea urchin sperm are able to make their way through ocean water to find eggs to fertilize.