大家好,我是长颈鹿。我是世界上最高的动物。我的祖先并不高,主要靠吃草为生。后来自然条件发生变化,地上的草越来越少,为了生存,必须努力吃高大树木上的树叶。这样,一代代传下来,我们就变成了现在脖子和腿特别长的样子了。 Hello everyone, I am a giraffe. I am the tallest animal in the world. My ancestors are not high, mainly by grazing for a living. Later, changes in natural conditions, fewer and fewer grass on the ground, in order to survive, we must strive to eat the leaves of tall trees. In this way, from generation to generation, we have become particularly long now neck and legs.