Simian Selves: From the Mirror Test to Habeas Corpus

Abstract

Simple Summary What makes a being deserving of legal rights? Is it the ability to feel pain or the capacity to know oneself as an individual? This study traces how shifting scientific answers to these questions have shaped Western animal law over the last two hundred years, focusing on nonhuman primates. In the UK, the first laws protecting animals emerged in the nineteenth century. They focused on an animal’s capacity to feel pain rather than its mental abilities. This research follows the historical shift toward recognizing self-awareness as a new standard for granting legal rights. It analyzes how experiments like the mirror self-recognition test, which demonstrated that chimpanzees can recognize their own reflections, became evidence in the 2013 legal case seeking personhood for a chimpanzee named Tommy. By situating this landmark case in the history of human–animal relations, this paper suggests that the scientific and legal definitions of “human” and “animal” change together over time. Emphasizing similarities to humans has helped advocate for the rights of some primates. However, it also risks creating new hierarchies that leave other species behind. This research clarifies the role of scientific knowledge in shaping our ethical and legal responsibilities toward other living beings. It helps us understand the evolving boundaries of multispecies justice in a changing world.