To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Video 2 Movie S2. Animations of the Von Mises stress distributions from finite element models of a Trypoxylus dichotomus horn loaded under vertical bending, lateral bending, and twisting. Structural adaptations to diverse fighting styles in sexually selected weapons Erin L. McCullough, Bret W. Tobalske, and Douglas J. Emlen PNAS. 2014. 111:14484-14488 DOI: 10.1073/pnas.1409585111 Download Original Video Browse All Videos »