aquatic mammal 水栖哺乳动物
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。
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。
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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