The body shape is fusiform and the modified forelimbs, or fins, are paddle-shaped. The end of the tail is composed of two flukes, which propel the animal by vertical movement, as opposed to the horizontal movement of a fish tail. Although whales do not possess fully developed hind limbs, some (such as sperm whales and baleen whales) possess discrete rudimentary appendages, which may have feet and digits. Most species have a dorsal fin.
In March 2014 in Japan a bottle-nosed dolphin with hind fins about as big as a man's hands, was captured