Comparing the intelligence of animals of different species is difficult although there are certain tests and problem sets that have proved to be useful.

比较不同种类的动物之间的智商是一件很困难的事情，虽然有某些测试和问题设置已经证明了很有用。

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Plant biology is complex and fascinating, but it differs so greatly from that of animals that so-called evidence of plants' intelligence is inconclusive, the authors wrote.

作者写道，植物的生命机理复杂且有趣，但与动物的生命机理差异非常大，以至于所谓的能证明植物有意识的证据虽然有趣，却站不住脚。

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You would never go back to an ordinary dog. The level of intelligence and social awareness in these animals is staggering.

你不会再去养一只普通的狗，这种动物的智力和社会意识水平非常惊人。

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By the same token, displays of evident affection on their parts and extraordinary tales of the conscience and loyalty of Balto, for example, or the miraculous intelligence of Alex the African gray notwithstanding, most nonhuman animals don't really feel the same way about us.

CNN: I don't love your dog -- and you can't make me!

But, many animals with comparable intelligence are being treated with extreme cruelty, and most of us turn a blind eye.

CNN: Michael Vick doesn't deserve a dog