"On the Gait of Animals" is a scientific treatise written by Aristotle in which he explores the physical movements of animals. The text covers a wide range of topics, including the differences in gait between quadrupeds and bipeds, the various ways in which animals move their limbs, and the relationship between an animal's gait and its overall anatomy. Aristotle's observations are based on detailed examinations of various animal species, from horses and elephants to insects and crustaceans. Through his careful observations and logical deductions, Aristotle lays the foundation for the scientific study of animal locomotion, a subject that would be further developed by subsequent generations of scholars.