A New York state court heard arguments that chimpanzees can be considered persons with some legal rights. In connection with that case, the philosopher Peter Singer argues that there is no good reason to keep chimpanzees and apes in prison: “The ethical basis for extending basic rights to chimpanzees and the other nonhuman great apes is simple: chimpanzees are comparable to three-year-old humans in their capacity for self-awareness, for problem-solving, and in the richness and complexity of their emotional lives, so how can we assign rights to all children and not to them?” And if chimpanzees have any kind of rights, can chimpanzees who were research subjects in developing vaccines that save human lives be left to die on an island when no longer needed for research?