To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1. Adult female California sea lion performing a porpoising bout in front of a viewing window (National Zoo of the Smithsonian Institution, Washington, DC). The role of California sea lion (Zalophus californianus) hindflippers as aquatic control surfaces for maneuverability Ariel M. Leahy, Frank E. Fish, Sarah J. Kerr, Jenifer A. Zeligs, Stefani Skrovan, Kaitlyn L. Cardenas, and Megan C. Leftwich Journal of Experimental Biology 2021. 224:None-None; doi: 10.1242/jeb.243020 Download Original Video