Fig. 1. Polar coordinate plots of the predatory strike of Cerastes cerastes. In each plot, the strike angle was measured between the long axis of the snake’s head and the midpoint of the prey’s body (with 0° defined as directly in front of the snake); distance (in cm) was measured from the tip of the snake’s snout to the midpoint of the prey. (A) Control strikes; (B) strikes following denervation of the olfactory and vomeronasal nerves; (C) strikes following denervation and bilateral occlusion of the eyes. Note the similarity between the control and denervated strikes and the marked decrease in distance and strike angle following occlusion of the eyes.