How, though, does blubber help dolphins and porpoises to swim so fast ​ — Dall’s porpoises at speeds of up to 35 miles (56 km) an hour?
Tetapi, bagaimana lemak membantu lumba - lumba berenang begitu cepat ​ — lumba - lumba Dall, misalnya — ​ dengan kecepatan hingga 56 kilometer per jam?