Animal law is a rapidly growing field, appearing in law schools, courtrooms, and the media on a constant basis. The study of the law regarding animals combines a review of the statutory and decisional law in which the nature?legal, social and/or biological?of non-human animals is an important factor. Owing to the rapid growth in this field, the sixth edition has updates in almost every chapter, with new focus on cases involving animals in agriculture and the complex legal challenges to laws aimed at providing them with greater protections. In connection with that expansion, a new section addresses the growing advent of "ag-gag" laws and legal issues surrounding them. And the interplay of constitutional law and animal issues is further highlighted with discussion of recent cases and statutory developments.