Mark Twain said this quote

“ No, it was a human thing. You should not insult the brutes by such a misuse of the word; they have not deserved it . . .It is like your paltry race--always lying, always claiming virtues which it hasn't got, always denying them to the higher animals, which alone posses them. No brute ever does a cruel thing--that is the monopoly of those with the Moral Sense. When a brute inflicts pain he does it innocently; it is not wrong; for him there is no such thing as wrong. And he does not inflict pain for the pleasure of inflicting it--only man does that. Inspired by that mongrel Morel Sense of his! A sense whose function is to distinguish between right and wrong, with liberty to choose which of them he will do. Now what advantage can he get out of that? He is always choosing, and in nine time out of ten he prefers the wrong. There shouldn't be any wrong; and without the Moral Sense there couldn't be any. And yet he is such an unreasoning creature that he is not able to perceive that the Moral Sense degrades him to the bottom layer of animated beings and is a shameful possession. Are you feeling better? Let me show you something. ”