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。

youdao

youdao

youdao

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