為什么說海豚是世界上第二聰明的動物？
Today at Discovery News you can find out why dolphins are now believed to be the world's second most intelligent animals, with only humans displaying greater brainpower.
今天，在探索新聞里，我們將向您揭示為何海豚被認為是目前智力僅居于人類之后的、世界上第二聰明的動物。
Intelligence itself is a very loaded issue. It's difficult to compare one individual's brilliance with that of another within the same species, much less to attempt to compare intelligence among multiple species. Intelligence is just one component of a species' survival, so one can argue that spiders have evolved to be as smart as they need to be for their species to continue, rats are as brainy as they need to be, and so on.
智力本身就包含著許多復雜的因素.在同一物種中，都很難比較兩個個體的智商的高下，更不必說在不同物種間了。智力是一個物種得以生存繁衍的條件之一。因此，我們可以認為，蜘蛛的智力水平進化到了這個物種能夠得以生存的程度，老鼠等也是如此。
If human standards for intelligence are applied to non-human animals, however, dolphins come very close to our own brain aptitude levels, suggests Emory University dolphin expert Lori Marino.
埃默里大學海豚專家洛里馬里諾說，如果把人類的智力水平評判標準應用到動物身上，則海豚的大腦資質(zhì)水平和人類的十分相近。
She's performed MRI scans of dolphin brains. The scans prove dolphin brains are:
·big, relative to body size
·intricate, with a neocortex "more highly convoluted than our own"
·structured to allow for self-awareness and the processing of what Marino calls "complex emotions"
她對海豚的大腦進行了核磁共振掃描.結(jié)果顯示，海豚的大腦有以下特征:
·大腦很大--相對于體形來講；
·復雜--大腦皮質(zhì)褶皺程度比人類的還要高；
·有產(chǎn)生自我意識的結(jié)構(gòu)和處理圣馬力諾所謂的“復雜的感情”的結(jié)構(gòu)。
All animals share the capacity for emotions, she explained, but the part of the dolphin brain associated with processing emotional information is particularly expanded.
她說,雖然所有的動物的大腦都具備處理情感信息的能力，但是海豚大腦的這個能力特別強。
Why then did dolphins evolve to become so brainy?
那么為什么海豚的智商進化到如此之高呢？
Marino and her colleagues have analyzed modern dolphins and remains of ancient marine mammals to help answer that question.
馬里諾和她的同事通過研究現(xiàn)代的海豚和古代海洋哺乳動物的化石，揭示了問題的答案。
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