Figure 3. 2-dimensional paths of a sergestid shrimp (1) and a fish (2) as viewed from port and starboard cameras. Because of the camera angles the sergestid appears to lobstertail at two different angles and the apparent paths of the fish are diametrically opposed, but when the x,y coordinates of the two animals' positions in both views were combined to calculate 3-dimensional positions, the correct paths could be determined.