Some scientists, however, say that the dolphin, a sea mammal, is just as smart.

然而，有些科学家说，海豚，一种海中的哺乳动物，也有那么聪明。

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Dr Vincent Janik, of the sea Mammal Unit at St Andrews University, said they conducted the research on wild dolphins.

圣安德鲁大学海洋哺乳动物研究中心的文森特·雅尼克博士说，他们的研究对象是野生海豚。

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The manatee, often called the sea cow , is the only exclusively herbivorous marine mammal.

海牛，通常也称之为海中之牛，是唯一一种海洋食草哺乳动物。

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