词数:325阅读难度:★★☆☆☆建议阅读时间:6分钟Birds can learn to choose the best building materials for their nests,according to scientists.It was previously thought that birds’choice of nest materials was determined by their genes,that is,each type of bird has their own methods of building nests born with them.But an experiment has now shown this to be a more complex activity.The study,published in the Royal Society Journal Proceedings B,involved giving zebra finches(斑胸草雀)a Word Count: 325 Reading difficulty: ★★ ☆☆☆ Suggested reading time: 6 minutes Birds can learn to choose the best building materials for their nests, according to scientists. It was previously thought that birds’ hearing of nest materials was determined by their genes, that is, each type of bird has their own methods of building nests born with them.But an experiment has now shown shows this to be a more complex activity. The study, published in the Royal Society Journal Proceedings B, involved giving zebra finches (Zebra Finch) a