Fig. 4. Profiles of key kinematic variables in Kogia and Tursiops as a percentage of total feeding cycle duration: gape, gular depression, gular retraction and prey distance. Gular retraction is scaled along the right y-axis and all other variables on the left y-axis. (A) Kinematic profile of Kogia. (B) Kinematic profile of Tursiops closed gape approach. (C) Kinematic profile of Tursiops open gape approach (gular retraction is not depicted). Feeding phases I-IV (preparatory, jaw opening, gular depression and jaw closing) are denoted below each graph. Kogia and Tursiops closed gape approach display similar patterns in gular depression and retraction, gape and prey distance relative to the onset of each feeding phase; however, Kogia kinematics occurred at a much faster rate. Tursiops open gape approach included a notably delayed gular depression phase onset as a result of slow gape increase. Note gular return to baseline following completion of the feeding cycle.