地球上属于鲸目的动物有90多种,实在是一个庞大的家族。但是所谓鲸鱼,事实上它并非真正的鱼,而是一种鱼形的脊椎动物,隶属于哺乳纲,鲸目。5000多万年以前,现代鲸的祖先离开陆地进入了广袤无垠的大海,然后经过漫长的岁月,才逐渐演化成现在的样子,遍布于世界的海洋中。当你站在北 There are more than 90 species of animals that are whale-loving animals on the earth. It is indeed a huge family. But the so-called whale, in fact, it is not a real fish, but a fish-shaped vertebrate, affiliated with mammals, cetaceans. More than 50 million years ago, the ancestors of modern whales left the land to enter the vast expanse of sea, and then after a long period of time, they gradually evolved into what they are today and spread throughout the oceans of the world. When you stand in the north