Figure 1.

Examples of body markings used to identify individuals. Video captures from different nights (rows) are shown for three sets of distinctive characters (aligned vertically) present in the same individual. Line drawings from the bottom row of photos summarize the character sets used to identify this individual: left, three spots and a larger white patch on the lower caudal fin lobe; middle, six scars and a white snout marking on the left side of the head; and right, a V-shaped patch and several dark spots on the left flank.