Horton Hears A Who!: Yellow Back Book (Dr Seuss - Yellow Back Book) - Dr. Seuss

"Horton Hears a Who" is about an elephant named Horton who saves a tiny world on a speck of dust from the dangers of his world. I would use this in kindergarten through second grade to talk about how friendship can be found in the strangest places and that you should always keep your promises even when someone else wants you to break it.