zoological treatise on the study of the causes that have determined the composition of each animal species and also the investigation of the physiology, teleology, and functions of the parts of animals. Books I-III: Methodological observations, classifications. Sensation, movement, nutrition. Observations on the parts of animals.

Aristotle, son of the physician Nicomachus, was born in Stagira in 384 BC. There is little information about the early years of his life. At the age of seventeen, he went to Athens to study at the Platonic Academy. He remained there for twenty years, from 367 to 348 BC, when Plato died. Then Aristotle left for Assos in Troas and after a three-year stay there went to Lesbos and then to Macedonia, where he took on the education of the royal child Alexander.

When his student ascended the throne, Aristotle settled in Athens and founded his school, the Lyceum. After the death of Alexander (323 BC), the philosopher's stay in Athens became difficult. He was forced to flee to Chalcis, his mother's homeland, where he died in 322.

As a universal spirit, Aristotle created a vast and valuable philosophical and scientific work. Epistemology, logic, theology, physics, biology, psychology, ethics, political philosophy, aesthetics are the main fields of knowledge that he researched and studied. The Alexandrian Hermippus estimated Aristotle's works to number 400. To this day, lists have survived that include 143 titles of his works. Diogenes Laertius estimated the number of lines in Aristotle's writings to be 440,000. The impact of his work on the formation of world thought was strong for centuries, and it remains so.

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