Do non-human animals have moral standing? Work on this question has focused on choosing the right grounding property (for example, personhood or sentience) while little attention has been paid to the various ways that the connection between grounding properties and moral standing has been explained. In this paper, I address that gap by offering a fresh way to approach the debate over the grounds of moral standing, including a novel taxonomy of positions, and argue that one kind of position, which (...) takes a ‘value-first’ approach, is preferable to the other, which takes an ‘interests-first’ approach. According to value-first accounts, some individuals have moral standing because they have properties that make them valuable. According to interests-first accounts, some individuals have moral standing because they have interests, and any interest must always be taken into account. I argue that we should prefer value-first accounts because they engage directly with the problem the concept of moral standing is employed to solve, and because interests-first accounts cannot meet their explanatory burdens without begging the question against value-first accounts. (shrink)