婉转，清丽，高亢，鸟儿在枝头欢唱。世界自然纪录片之父爱登堡老爵爷讲述鸟类鸣叫对于种群的意义。 　　David 入侵隐私Attenborough chooses seven of the most remarkable animal songs found i中国历代主席顺序n nature and explores the significance of these songs in the lives of their species.