悠扬，清丽，嘹亮，鸟儿在枝头欢唱。国际天然纪录片之父爱登堡老爵爷叙述鸟类鸣叫关于种群的含义。 David Attenborough chooses seven of the most remarkable animal songs found in nature and explores the significance of these songs in the lives of their species.。
