Book excerpt: The wild jaguar is likely the most rare and revered mammal in the United States. Yet, Janay Brun was lucky enough to see one during an evening walk in the Arizona desert. Meeting this jaguar-which came to be known to the world as Macho B-launched her remarkable ten-year odyssey of following the big cat's trail. Their captivating and disturbing story begins in remote lands along the border with Mexico and ends unexpectedly in the halls of a Tucson federal courthouse.