BEH 3794 Supplementary material
Videos showing a threat display in white sharks. The purpose of a threat display is to warn an unfamiliar animal or object not to approach any closer without resort to the actual physical contact that occurs during combat. Individuals could be stressed, and respond by performing an agonistic display. The videos capture the spasmodic shivering of the body that accompanies the posturing of the tail and pectoral fins to make the shark appear larger and opening of the jaws to reveal its biological weaponry.