Biophilia is a concept that has been much utilized as a foundation for an environmental or “land” ethic. E.O. Wilson characterizes it as a genetic disposition that links human survival to valuing living systems. J. Baird Callicott argues that human sentiments are naturally directed to all living systems and beings and this sentiment has evolutionary value. This author contends that if biophilia is to be a viable foundation for such an ethic, it must be conceived more abstractly and broadly as an interconnecting feature of biotic systems. The foundation for such a conception can be found in Aristotle’s ethics, wherein his discussion of friendship, philia , can provide a theory of interspecies obligation. Although Aristotle’s focus in the Nicomachean Ethics is human relations, he makes it clear that this sentiment can be felt towards other living beings. This paper develops a broader conception of philia that includes interspecies relationships and then reconceives the modern concept of biophilia as a form of interspecies philia . It goes on to argue, using Aristotle’s theory of obligation as reciprocity within friendship, that such a re-conception of biophilia might provide another approach to founding an environmental ethic on a theory of sentiment.