He uses his paddle-shaped tail as a rudder to steer with, or, if he wants to put on a burst of speed, he may occasionally scull with ft, as if it were an oar.

• 它用自己鳍状的尾巴作为控制方向的舵，或当它想突然增加速度时，有时可用尾巴划水，就仿佛后者是浆。