<Li> Jim Carrey as Horton, an outgoing, eccentric, big - hearted, loving, sweet, and thoughtful elephant and teacher in the Jungle of Nool . Horton has no tusks, lives by himself and possesses acute hearing abilities . </Li> <Li> Steve Carell as Mayor Ned McDodd, the mayor of Whoville . He has 96 daughters, 1 son named JoJo and a wife named Sally . </Li> <Li> Carol Burnett as Sour Kangaroo, who mistrusts Horton's inquisitive nature as a threat to her legal authority over Nool . </Li> <Li> Will Arnett as Vlad Vladikoff, a scary, savage, eccentric Russian - accented vulture hired by the Sour Kangaroo to steal Horton's clover . </Li>

Who played the kangaroo in horton hears a who