RESUMO
Speciesist or biological accounts of moral status can be defended by showing that all members of Homo sapiens have a moral status conferring property. In this article, I argue that the most promising defense locates the moral status conferring property in the relational property of being biologically tied to other humans. This requires that biological ties ground moral obligations. I consider and reject the best defenses of that premise. Thus, we are left with compelling evidence that biological ties and membership in a biological category like "species" ground neither moral obligations nor moral status. Because it is crucial to account for the moral significance of family bonds, I conclude by describing the sense in which biological ties matter morally.
