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分類：自然
集數：1集
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簡介：動物群是地球上最偉大的生物現象之一：大群的動物在同一時間聚集在同一個地方。見證這些罕見的現象是最震撼的自然體驗之一。驅動這些現象的力量也是科學研究的一個重要課題。為什麼這些動物繁衍壯大，而其它動物卻幾乎無法生存？收起
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