Switching around the numbers and letters on the arrival-departure board seems harmless to Curious George, but it causes mass mayhem in the train station.
Elephant leads a troupe of monkeys into a cave they have been afraid to explore, and after admiring the paintings found on the walls they make their own art with mud, squabbling over whose painting is best until Elephant explains that this is not a game to win or lose.
Rhyming text and illustrations demonstrate how many monkeys it takes to make a tail-tangling, tree-dangling jungle jamboree and how many combinations of numbers will add up to ten.