This paper examines the significance of Aristotelian desire (orexis) for the onto-genesis of Dasein as care (Sorge). In an early Marburg lecture course devoted to Aristotle, Grundbegriffe der aristotelischen Philosophie, Heidegger claims that Dasein is determined by two fundamental possibilities of movement; flight (phug!) and pursuit (airesis). Both possibilities reflect Aristotle’s exposition of orexis in De Anima and become appropriated by Heidegger to orient the primordial relation of Dasein to its thrown facticity. As the origin of movement in living beings, orexis sufficiently problematizes the ontological caesura separating Dasein from animality.