|“||If you can't see, hear, or feel something, it doesn't exist. And believing in tiny imaginary people is just not something we do, or tolerate here in the Jungle of Nool. You will not breathe a word of this lie to anyone else--especially the children! I don't want you poisoning their minds with this nonsense. Our community has standards, Horton. If you wanna remain a part of it, I'd recommend you follow them. Have a nice day.||„|
|~ Sour Kangaroo threatening Horton to be quiet about his belief about the speck.|
Sour Kangaroo, also known as Jane Kangaroo, is the (former) main antagonist of the 1954 children's book ,Horton Hears A Who!, by Dr Seuss, the 1970 animated television special, Horton Hears A Who!, the 1992 animated film I Can Hear You, the 2000 Broadway musical, Seussical, and Blue Sky Studios's 4th film, Dr. Seuss's Horton Hears a Who!. She also appears in the Horton Hears A Who! story in the 1996 live action/puppet TV series, The Wubbulous World of Dr. Seuss.
A busybody and creator of the jungle's laws, she does not believe Horton the Elephant about the Whos and Whoville on the dust speck. She hires a vulture named Vlad to steal the clover bearing the speck for her. When he fails to do so, she orders her henchmen, a group of monkeys known as the Wickersham Brothers to take the speck from Horton.
After everybody was able to hear the Whos, her son, Rudy jumped out his mother's pouch and gave the speck back to Horton, much to Sour's dismay, but in the end Horton forgives her despite everything she has done to him.
- She is the second main antagonist of a Blue Sky Studios movie who is a parent, after Madame Gasket.
- She is also the first second main antagonist of a Blue Sky Studios movie who doesn't die in her movie.
- In addition, She is also the first second main antagonist of a Blue Sky Studios movie who redeems herself.
- She is voiced by June Foray in the 1970 television special, Carol Burnett in the 2008 film, who also played Miss Hannigan, and Stephanie D'Abruzzo in The Wubbulous World of Dr. Seuss. Sharon Wilkins portrayed Sour Kangaroo on Broadway. She is also the main antagonist in the stage musical named Seussical with all of the Dr. Seuss characters featured.