  In this fluid mechanics video, we explore the kinematics of chemotaxing sperm
cells (sea urchin, \textit{Arbacia punctulata}) swimming in a chemoattractant
gradient. We demonstrate that the complex swimming trajectories resulting in
chemotactic behavior (`turn-and-run' motility) are comprised of several
distinct flagellar maneuvers. These motility patterns likely play an important
role optimizing chemotaxic motility and navigation, when the sperm cells are
subjected external fluid flows.
