To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1 Animations of 4-bar models fit to the bass opercular mechanism The opercular mouth-opening mechanism of largemouth bass functions as a 3D four-bar linkage with three degrees of freedom Aaron M. Olsen, Ariel L. Camp, and Elizabeth L. Brainerd Journal of Experimental Biology 2017. 220:4612-4623; doi: 10.1242/jeb.159079 Download Original Video