" The problem with this game of special characteristics is that non-humans can never win. When we determine that parrots have the conceptual ability to understand and manipulate single-digit numbers, we demand that they be able to understand and manipulate double-digit numbers in order to be sufficiently like us. When a chimpanzee indicates beyond doubt that she has an extensive vocabulary, we demand that she exhibit certain levels of syntactical skill in order to demonstrate that her mind is like ours. The irony, of course, is that whatever characteristic we are talking about will be possessed by some nonhumans to a greater degree than some humans, but we would never think it appropriate to exploit those humans in the ways that we do nonhumans. "

― Gary L. Francione , Animals as Persons: Essays on the Abolition of Animal Exploitation