An incredibly engaging interactive numbers book - move the buttons along the special track to count all your favorite farm animals from the popular lullaby "Professor McDonald Had a Farm." Little children will have lots of fun moving the buttons on the pages to bring Professor McDonald's noisy farm to life! A numbers book like no other, created by bestselling author Camilla Reid, with an irresistible and highly satisfying interactive element that makes it the perfect way to introduce preschoolers to arithmetic. Filled with sheep, cows, pigs, and other beloved farm animals - and of course a noisy tractor - "Professor McDonald Had a Farm" is richly detailed in its scenes, illustrated by the extremely talented Jill Howarth.