Horton Hears a Who! is a book written by Dr. Seuss, starring Horton the Elephant, the Sour Kangaroo, the Young Kangaroo, the Mayor, the Wickersham Bros, Vlad Vladakoff, the Whos, and JoJo. It was published in 1954 and the first children's book written by Seuss after he moved to La Jolla. This story has been made into a cartoon which was included in a special edition DVD of How the Grinch Stole Christmas! This story has also been made into a movie. This book has an iOS and Android app by Oceanhouse Media.