Calarco's introduction to animal studies provides a practical evaluation of the dominant theoretical and academic approaches to the "animal question." While the text is mainly aimed at activists who are unfamiliar with theory, it also offers a solid foundation for undergraduates or academics who are new to the field. Animal studies scholars, however, will be acquainted with most of the material.
The main innovation Calarco provides is his division of the field into the three titular rubrics: thinkers of identity like Singer or Regan propose similarities between animals and humans as a basis for ethics, while the difference approach, exemplified mainly by deconstruction, takes radical alterity as its point of departure. The third approach, and the one Calarco identifies with most clearly, is indistinction. Represented by Haraway, Deleuze and Plumwood, this way of thinking rejects the directionality of the first approach as well as the division proposed by the second. Attempting to think beyond the anthropological difference, its proponents consider not how some animals are like humans, but what humans have in common with other animals.
This trifold division comprises the most problematic aspect of the book. While the identity category remains relatively stable, difference and indistinction begin to bleed together when considered more critically. The claim that Derrida insists on the anthropological difference, for example, is founded on a specific reading of one passage from "Violence towards Animals," which can just as well be understood as a hesitation to foreclose any unanticipated forms of thought. Moreover, Derrida maintains kinship within difference, as well, as he repeatedly stresses the mortality that binds humans and other animals together. This emphasis on finitude seems to place him much closer to Plumwood than Calarco suggests. However, the problematic relationship between these two categories can be read as a Heideggerian Holzweg, as it contains especially rich potential for future considerations of difference and similarity within and beyond the field.
The most fruitful aspect of Calarco's book is his insistence that his readers "inhabit" each of the positions he articulates in order to develop new paradigms of thinking and living with animals. Such openness is at the core of animal studies as a field; therefore, Calarco's emphasis on it will benefit new readers as well as serve as a useful reminder for scholars who are familiar with the field.