In the book, a mother bird can't continue to sit on her egg, so she asks Horton the Elephant to sit on it for her. He decides he will commit himself to it and is "faithful one hundred percent." All sorts of troubles come his way because of his resolve to care for the egg no matter what. After sitting faithfully on the egg for fifty one weeks, it finally hatches. A one-of-a-kind "Bird-Elephant" emerges and Horton is happy one hundred percent.
I'm going to hunt for a Spanish translation.
