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鯨魚、海豚、鬣蜥與企鵝，這些動物都無法像魚類在水底呼吸，卻能稱霸海洋。牠們的祖先不諳水性，卻冒著生命危險返回大海覓食，這留給後代天大的缺陷：牠們只有肺，只能在水面呼吸。鯨魚最極端了，牠甚至來個體型大改造，腳掌換成魚鰭，完全不考慮返回原本熟悉的陸地，睡覺的時候隨時保持警戒，永遠只能半夢半醒，否則會忘記呼吸。有些鯨魚甚至離開海底到海灘掠食，但這麼做是在冒險，冒險返回不再屬於牠們的世界。
#海洋生態 #自然 #生物
分級:
片長:
發音:
發行:
導演:
分級: 普遍級
片長: 25 min
發音: 華語
發行: 2006-12
導演: 大麥影像傳播工作室
片長: 46 min
發行: 2007-03
導演: 三立電視
片長: 43 min
發行: 2005-12
導演: 陳輝勝、何德揚主持,臺灣電視公司
片長: 47 min
發行: 2010-01
導演: 蔣時盛
片長: 41 min
片長: 48 min
片長: 24 min
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