Diet for a New America - By John Robbins. A classic exposition of all the many reasons to be a vegetarian.
Animal Liberation - By Peter Singer. The classic book on animal rights.
The Lives of Animals - By Jon Coetzee. Written by the University's newest Nobel Prize winner. An interesting, complex book about the question of animal rights and the nature of academic debate.
Dominion - By Matthew Scully. A comprehensive and impassioned examination of the ways in which humans exploit other animals. Written by a former speechwriter to George W. Bush.