His writings on biology resulted from his research into natural history on and around the island of Lesbos, and have survived in the form of four books, usually known by their Latin names, De anima (On the Soul), Historia animalium (History of Animals), De generatione animalium (Generation of Animals), and De partibus animalium (On the Parts of Animals).
Os seus escritos sobre bioloxía foron o resultado da súa investigación na historia natural na illa de Lesbos, e sobreviviron en forma de catro libros, xeralmente coñecidos polos seus títulos en latín, De anima (Sobre a alma), Historia animalium (Historia dos animais), De generatione animalium (A xeración dos animais) e De partibus animalium (As partes dos animais).