In Part IV, Gulliver tries to imitate: the Houyhnhnms.
Houyhnhnms are a fictional race of intelligent horses described in the last part of Jonathan Swift's satirical Gulliver's Travels.
Gulliver's visit to the Land of the Houyhnhnms is narrated and described in Part IV of his Travels, and its location illustrated on the map at the start of Part IV.
Gulliver's Travels is a prose satire written by Irish writer and clergyman Jonathan Swift, that is both a satire on human nature and the "travellers' tales" literary subgenre.