The book under review offers a novel approach to politicizing the “animal issue.” Drawing on liberal citizenship theory, the authors argue that key concepts of international justice such as “citizen,” “denizen,” and “sovereignty” may be mapped onto human–animal relations in order to protect individual animal rights as well as ecosystem integrity. The ambition is also to overcome some well-known problems of traditional animal rights theory in relation to ecological concerns. Yet the argument that ecosystems, like human states, ought to be seen as sovereign communities entails problematic concept-stretching that may undermine the individual rights it was meant to protect.