Movie S1.

Mouth cavity expansion and volume measurement during a sample suction-feeding strike. On the Left, an X-ray reconstruction of moving morphology (XROMM) animation shows the motion of the skeleton (beige) and the dynamic digital endocast (purple) during suction feeding. On the Right, the motion of the dynamic digital endocast alone is shown during the same strike. Because the endocast is linked to the skeletal models, it deforms as the bones move to accurately measure mouth cavity volume throughout the strike. These data were originally recorded at 300 Hz but have been slowed down 20 times in this movie.