Unkempt humanlike beasts who live in servitude to the Houyhnhnms. Yahoos seem to belong to various ethnic groups, since there are blond Yahoos as well as dark-haired and redheaded ones. The men are characterized by their hairy bodies, and the women by their low-hanging breasts. They are naked, filthy, and extremely primitive in their eating habits. Yahoos are not capable of government, and thus they are kept as servants to the Houyhnhnms, pulling their carriages and performing manual tasks. They repel Gulliver with their lascivious sexual appetites, Yet despite Gulliver's revulsion for these disgusting creatures, he ends his writings referring to himself as a Yahoo, just as the Houyhnhnms do as they regretfully evict him from their realm. Thus, "Yahoo" becomes another term for human, at least in the semideranged and self-loathing mind of Gulliver at the end of his fourth journey.