There is more unknown than known when it comes to this giant aquatic mammal.

每当提起这种巨大的水栖哺乳动物，未知的总是比已知的多。

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Also called duckbill semi aquatic egg-laying mammal native to Tasmania and southern and eastern Australia.

鸭嘴兽是半水栖卵生哺乳动物，原产于塔斯马尼亚岛和澳洲地窍部及东部。

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In China, conservation efforts have already failed to protect the Yangtze River dolphin, the first large aquatic mammal to go extinct since the Caribbean monk seal in the 1950s.

在中国，保护白鳍豚免于灭绝的努力已经失败。白鳍豚是继上世纪50年代加勒比僧海豹之后，首个灭绝的大型水生哺乳动物。

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These mechanisms, part of the Marine mammal diving response, are adaptations to living in an aquatic environment and help during the process of sleeping.

这些机制作为部分海洋动物潜水的反应，是对在水生环境中生活的适应，并有助于睡眠。

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These mechanisms, part of the Marine mammal diving response, are adaptations to living in an aquatic environment and help during the process of sleeping.

这些机制作为部分海洋动物潜水的反应，是对在水生环境中生活的适应，并有助于睡眠。

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