This is the first book to evaluate the significance and usefulness of the practices of anthropomorphism and anecdotalism for understanding animals.

Heyes correctly points out some problems in primate theory of mind, but lacks a critical approach to children's theory of mind, and at times implies meta-awareness when discussing theory of mind. Also, in selecting pure experimental designs, she ignores its limitations, as well as the merits, and at times the necessity, of other methodologies.

Wilkins & Wakefield's intriguing model of language evolution is deficient in evidence of human uniqueness in metaphorical matching, amodal representation, reference, conceptual structure, hierarchical organization, linguistic comprehension, sign use, laterality, and handedness. Primates show communicative reference, laterality, and handedness, and apes in particular show hierarchical organization, conceptual structure, cross-modal abilities, sign use, and displaced reference.