adaptation anecdotes animalrights animals animals(philosophy) animalsandcivilization animalwelfare aristotle behavior bio700f bio800f bioethics birds classification earlyworksto1800 ecology encyclopedias ethics eulenvögel fieldwork general georgeb history human-animalrelationships humangeography mammals medieval moralphilosophy nature northamerica owls phi005000nat039000 philology philosophy physiology pre-linneanworks reproduction science senseorgans socialaspects sociology sources systematik theology tiere travelschaller vertebrates veterinarymedicine wb9300 ws4100 zoogeography zoologie zoology