The blue whale is the largest animal on the earth at present. An adult blue whale can grow to about 30 times the weight of an African male elephant. The blue whale is a true sea monster, with an average body length of about 26 fans, a record high of 33.5 meters and an average weight of 150 tons. The tongue of a blue whale is more than 3 meters thick and weighs more than an elephant. The blue whale is also a unique strongman in the animal kingdom. A blue whale can generate1250kw of electricity at a speed of 28km/h, which is equivalent to the pulling force of a medium-sized locomotive. Once, a blue whale towed a 27-meter-long whaling speedboat for eight and a half hours, with an average speed of 9 kilometers per hour. At that time, the speedboat was retreating at full speed, but it was still pulled forward for 74 kilometers.