In History of Animals , Aristotle analyzes “differences”―in parts, activities, modes of life, and character―across the animal kingdom, in preparation for establishing their causes, which are the concern of his other zoological works. Over 500 species of animals are shellfish, insects, birds, fish, reptiles, amphibians, and mammals―including human beings. In Books I–IV, Aristotle gives a comparative survey of internal and external body parts, including tissues and fluids, and of sense faculties and voice. Books V–VI study reproductive methods, breeding habits, and embryogenesis as well as some secondary sex differences. In Books VII–IX, Aristotle examines differences among animals in feeding; in habitat, hibernation, migration; in enmities and sociability; in disposition (including differences related to gender) and intelligence. Here too he describes the human reproductive system, conception, pregnancy, and obstetrics. Book X establishes the female’s contribution to generation. The Loeb Classical Library® edition of History of Animals is in three volumes. A full index to all ten books is included in the third (Volume XI of the Aristotle edition). Related Volumes Aristotle’s biological corpus includes not only History of Animals , but also Parts of Animals, Movement of Animals, Progression of Animals , Generation of Animals , and significant parts of On the Soul and Parva Naturalia . Aristotle’s general methodology―“first we must grasp the differences, then try to discover the causes” (Ha 1.6)―is applied to the study of plants by his younger co-worker and heir to his school, Enquiry into Plants studies differences across the plant kingdom, while De Causis Plantarum studies their causes. In the later ancient world, both Pliny’s Natural History and Aelian’s On the Characteristics of Animals draw significantly on Aristotle’s biological work.
Aristotle (Greek: Αριστοτέλης; 384–322 BC) was an Ancient Greek philosopher and polymath. His writings cover a broad range of subjects spanning the natural sciences, philosophy, linguistics, economics, politics, psychology, and the arts. As the founder of the Peripatetic school of philosophy in the Lyceum in Athens, he began the wider Aristotelian tradition that followed, which set the groundwork for the development of modern science. Little is known about Aristotle's life. He was born in the city of Stagira in northern Greece during the Classical period. His father, Nicomachus, died when Aristotle was a child, and he was brought up by a guardian. At 17 or 18, he joined Plato's Academy in Athens and remained there until the age of 37 (c. 347 BC). Shortly after Plato died, Aristotle left Athens and, at the request of Philip II of Macedon, tutored his son Alexander the Great beginning in 343 BC. He established a library in the Lyceum, which helped him to produce many of his hundreds of books on papyrus scrolls. Though Aristotle wrote many treatises and dialogues for publication, only around a third of his original output has survived, none of it intended for publication. Aristotle provided a complex synthesis of the various philosophies existing prior to him. His teachings and methods of inquiry have had a significant impact across the world, and remain a subject of contemporary philosophical discussion. Aristotle's views profoundly shaped medieval scholarship. The influence of his physical science extended from late antiquity and the Early Middle Ages into the Renaissance, and was not replaced systematically until the Enlightenment and theories such as classical mechanics were developed. He influenced Judeo-Islamic philosophies during the Middle Ages, as well as Christian theology, especially the Neoplatonism of the Early Church and the scholastic tradition of the Catholic Church. Aristotle was revered among medieval Muslim scholars as "The First Teacher", and among medieval Christians like Thomas Aquinas as simply "The Philosopher", while the poet Dante Alighieri called him "the master of those who know". His works contain the earliest known formal study of logic, and were studied by medieval scholars such as Pierre Abélard and Jean Buridan. Aristotle's influence on logic continued well into the 19th century. In addition, his ethics, although always influential, gained renewed interest with the modern advent of virtue ethics.