Several years later he joined The Screaming Yahoos as guitar player and lead singer. Gulliver begins to get disgusted by the Yahoos and prefers the company of the Houyhnhnms. They allow the Yahoos to escape and they "confiscate" the pills. They are the rulers while the deformed creatures that resemble human beings are called Yahoos. Jim Henson's Creature Shop created several CGI wasps and some prosthetic make-up for the Yahoos. Yahoos are legendary beings in the 1726 satirical novel "Gulliver's Travels" written by Jonathan Swift.