Abstract
This essay explores the extent to which Aristotle’s zoological researches were influenced by his general psychological theory and specific psychological doctrines, and the match or mismatch between the results of his zoological investigations and his general position on questions such as definition, essence, form, and matter. It argues that psychology provides the major articulating framework for Aristotle’s zoology. Certain key points in his zoology and specific psychological doctrines influence his interpretation of the biological phenomena.