Horton is having a normal day until he hears a voice, one of the Whos. Jane Kangaroo sees this and tells everyone that Horton is crazy. In result, an eagle takes the flower where the Who's live and drops it into a flower field. Horton picks over 3 million flowers carefully picking up each one until he finds the Who's. No one still believes Horton and they are going to have the flower roasted and Horton locked in a cage.
He tells the Who's to make as much noise as they possibly can, Jane Kangaroo hears this along with everyone else. Later, Horton becomes the town hero for saving this tiny race.