 The next day, Jake morphs into a green anole lizard to spy on Chapman, and discovers that there is an entrance to the Yeerk Pool—a large, underground control center where the Yeerks can feed and recuperate—in their school.The teenagers, newly christened as Animorphs (from animal morphers) by Marco, head to The Gardens, a large zoo and amusement park, to acquire some new, battle-capable morphs.That evening, they decide to infiltrate the Yeerk Pool in order to rescue Tom, but find that Cassie has been kidnapped by the policeman-Controller.