Step 5 - Add Tail and Keel

Next, give your shark a caudal (tail) fin and a keel. Note that the caudal fin is shaped like that of a tuna, with upper and lower lobes that are more-or-less the same size (actually, the upper lobe is a little longer). Be sure to include the little 'flap' on the tip of the upper caudal lobe, properly termed a "subterminal lobe". Note also that the keel extends from about half-way between the pelvic and anal fins to mid-way along the base of the caudal fin.