This is a translation of Albert the Great's mid-13th century treatise on living things, De Animalibus, considered to be one of the most valuable contributions to the history of science, ranking in importance with the writings of Aristotle and Linnaeus. The text covers human anatomy, reproductive theories, equine and canine veterinary medicine, folk remedies against household pests, advice on training a falcon, theories on whether an ostrich will eat iron, and cures for rabies and sterility.