法国科学家汉克森做过一个实验:用人工方法同时孵化出一群家鹅和一群天鹅。他把一只家鹅雏放进天鹅群,又把一只天鹅雏放进家鹅群,让它们在一起生活半年后,出现了令人惊奇的结果:天鹅群里的家鹅虽不能翱翔蓝天,但可以轻松地飞行几百米,而与家鹅从小长大的天鹅却连飞离地面都十分吃力。 Hankson, a French scientist, did an experiment: a group of geese and a swarm of swans were hatched together by hand. He put a goose nest into the swan group, and put a swan nest into the geese group, let them live together for six months after the surprising results: swan herd goose swarm can not fly blue sky , But can easily fly a few hundred meters, and the swan grew up with the goose was flying from the ground are very difficult.