This chapter attends to Pythagoras’ great speech in Ovid’s Metamorphoses, and its eccentric poetic metaphysics. Sissa shows how, for Ovid, the change that forms and permeates the cosmos follows a certain logic and operates as a very particular kind of becoming, one that produces stabilities that endure for a time and then flow away. Out of this form of becoming emerges not only a taxonomy of human, non-human animals, and plants, but also an ethics of eating. Whereas any non-human animal may derive from a human being, comestible plants are metamorphosis-free. This ethics is born not out of respect for non-human life but out of the fear of anthropophagy, and in this, the poem remains an anthropocentric text. But, as Sissa demonstrates, its metamorphic fluidity undermines any sense of human exceptionalism, and thus presents us with the paradoxical formation of an anthropocentrism that is also posthuman.