He was the first to attempt the creation of a taxonomical categorization and hierarchy of animals, and he recognized that human and non-human animals differ only by degree in possessing certain temperaments.
He was the first to attempt the creation of a taxonomical categorization and hierarchy of animals. Aristotle perceived some similarities between humans and other species and developed a sort of "psychological continuum", recognising that human and non-human animals differ only by degree in possessing certain temperaments.