 Aristotle consistently says that animals that are more intelligent have the “purest” blood; and more generally, he asserts that the quality of blood affects the intelligence and temperament of animals (see, e.g., Generation of Animals 2.6 744a28–32, Parts of Animals 2.4 650b19–25, 651a12–16). Moreover, Aristotle suggests that these differences in blood occur not only across animal species, but also between the sexes in a species. His claim is that hot, thin, pure blood is best, because such blood correlates both with courage (manliness) and with practical wisdom (Parts of Animals II. 2 748a2–14). The implication is clearly that those animals that benefit from hot, thin, pure blood are superior both with respect to deliberative reasoning and with respect to the moral virtue of courage. So men, in virtue of their body temperature, have an advantage, both intellectual and moral, over women.