This beautiful book about the emotional lives of animals is one of my favourites. So often in cases of oppression, a line is attempted to be drawn that justifies it. For African American slaves the fact that they couldn't blush (which they could of course) meant they felt no shame and were a lesser species, for South American natives a court case was held to determine whether they were human and therefore worthy of any compassion. With animals, people attempt to deny, despite every external appearance to the contrary, that they feel pain. No evidence is produced to support this...