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分类：自然
集数：1集
导演：
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简介：动物群是地球上最伟大的生物现象之一：大群的动物在同一时间聚集在同一个地方。见证这些罕见的现象是最震撼的自然体验之一。驱动这些现象的力量也是科学研究的一个重要课题。为什么这些动物繁衍壮大，而其它动物却几乎无法生存？收起
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