Life arises from difference. That’s what biologist Lynn Margulis (1938–2011) averred when she proposed that endosymbiosis—the nesting of one unlike organism inside another—allowed for the evolution of multicellular entities on earth, and that various symbiotic unions remain integral to the flourishing of existence. Now accepted as scientific fact, Margulis’s assertions suggest that we have been moving mosaics of interspecies communion from the very beginning. This paradigm elicits a reconsideration of the boundaries and possibilities of being “human,” an intellectual project that might serve as