Derrida critically applied Levinas's ethics to the field of animal ethics. He believed that the animal can become the other in Levinasian ethics, and that it was more different than the human-other and thus was the other of the other. The animal allowed us to think more radically about subjectivity. Even if Levinas's principle of subjectivity: “here I am” emphasizes the passivity of subjectivity, it is still not radical enough for Derrida, because it is still too anthropocentristic. Derrida further promoted this principle of subjectivity to “I follow” through the ethical principles of Levinas: “after you”.“I follow therefore I am,” and what I follow could be not only be a person but also an animal. By critically applying Levinas's theory of hospitality to the interpretation of animal issues, Derrida further developed his thinking about subjectivity, and keep “questioning for sovereignty.”