Humans share the earth with nonhuman animals who are also capable of conscious experience and awareness. Arguing that we should develop an I-thou, not an I-it, relationship with other sentient beings, Donald A. Crosby adds a new perspective to the current debates on human/animal relations and animal rights—that of religious naturalism. Religion of Nature holds that the natural world is the only world and that there is no supernatural animus or law behind it. From this vantage point, our fellow thous are entitled to more than merely moral treatment: protection and enhancement of their continuing well-being deserves to be a central focus of religious reverence, care, and commitment as well. A set of presumptive natural rights for nonhuman animals is proposed and conflicts in applying these rights are acknowledged and considered. A wide range of situations involving humans and nonhuman animals are discussed, including hunting and fishing; eating and wearing; circuses, rodeos, zoos, and aquariums; scientific experimentation; and the threats of human technology and population growth.