Born in 384 BC and died in 322 BC. He was a student of the Greek philosopher Plato and tutor of Alexander the Great. He is called the father of zoology. He classified animals based on the presence and absence of blood and eggs and childbirth. Identified and classified about 520 species of animals. He wrote 146 books. His famous books are – Historia Animalium, On The Generation of Animals, On The Parts of Animals, Metaphysic etc.