Sour Jane Kangaroo is the main antagonist of Horton Hears a Who! She doesn't believe Horton about the Whos. Kangaroo is a busybody and creator of the jungle's laws who is skeptical about the existence of the Whos and Whoville on a dust speck. Her henchmen are a group of monkeys known as the Wickershams. She orders them to take the speck from Horton. When they fail to do so she talks to a vulture named Vlad to steal the speck for her.
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