While moral perfectionists rank conscious beings according to their cognitive abilities, Paola Cavalieri launches a more inclusive defense of all forms of subjectivity. In concert with Peter Singer, J. M. Coetzee, Harlan B. Miller, and other leading animal studies scholars, she expands our understanding of the nonhuman in such a way that the derogatory category of "the animal" becomes meaningless. In so doing, she presents a nonhierachical approach to ethics that better respects the value of the conscious self.

Cavalieri opens with a dialogue between two imagined philosophers, laying out...