Dolphins have names. Moreover, each dolphin receives its name at birth. Scientists proved this fact by recording a whistle-signal, which means a name, to which the same dolphin responded. The record for jumping belongs to a kangaroo, Australia's largest mammal. When danger approaches, the kangaroo manages to escape by jumping, relying on its tail as a pole, and can jump 10-12 meters in length, flying over the plain of the steppe at a height of about two meters. For a long time, it was be...