Sibley the horse lives on Stony Meadow Farm and is a hard worker the whole year round. Then Tractor Mac arrives at the farm, and suddenly, everything that Sibley used to do, Tractor Mac does, too. Sibley wonders if there is any room left for him--but when Farmer Bill and Tractor Mac get stuck in a soggy field, Sibley is the one who comes to their rescue, and Sibley and Tractor Mac learn that there's plenty for both of them to do at the farm.

This new edition to the Tractor Mac series is a board book that teaches children about the different colors of the rainbow. Tractor Mac and his vehicle and animal friends, including Sibley the horse, Pete the pig, and Goat Walter, show kids around Stony Meadow Farm in order to observe the colors of various objects found on the farm.

Betty the school bus is upset over making mistakes on her very first day, but Tractor Mac and the farm animals provide tips and encourage her to practice and try again. Full color.