Debate on Slate.com between the animal liberation philosopher Peter Singer and the US judge Richard Posner.

"There is a degree of irony in selectively applying compassion. It is as if there were truth to the slogan George Orwell's characters in Animal Farm came to believe, 'All animals are created equal, but some are more equal than others.' One example of this paradox is consumers who intentionally purchase "dolphin-free" tuna (i.e. tuna fishes that were caught and killed without injuring dolphins in the process). Their concern is solely for the dolphins (apparently because they are mammals, like us) with no regard for the dead tunas."