Shaped like a dolphin , but slightly bloated fat . Smooth gray skin But when it turns into the red brick and white spotted . Paddle -like forelimbs used to help force direction or take a walk on the sea floor. Hind limbs reduced until it was gone , leaving only the small bones inside the body. The end is forked caudal fin dolphin-like tail plane orientation. waving up and down like a dolphin 's tail to move forward.