To do what one ought to do: Reconsidering Heidegger's thesis: "the animal is poor in world."

This essay takes its point of departure from Section 63 of Martin Heidegger’s Fundamental Concepts of Metaphysics where, after a remarkable elaboration on the problem of the animal in relation to the question of world, he calls into question the accuracy of maintaining his guiding thesis on the animal: “the animal is poor in world.” Heidegger himself is not only troubled by the manner in which he situates the animal within a duplicitous framework of having and not having world but also by the manner in which he situates the quality of being poor in world as specifically a being deprived of world.