The ethical relationship between humans and other animals is most appropriately considered from the perspective of an organic metaphysics, such as that of A. N. Whitehead. Considerations that are critically examined include: (1) the utilitarian argument, which identifies moral relevance with the characteristic of sentience; (2) arguments based on rights, which justify the affirmation or denial of animal rights according to differing criteria; and (3) environmental ethics, which emphasize a holistic approach to ethical concerns. The utilitarian argument reflects the assumptions of a dualistic metaphysics and lacks relevance for environmental concerns. Rights arguments differ according to the capacities identified as necessary for the possess...