Pull the tabs and watch the pictures magically change in Big Tractor, a fantastic new title in the popular Priddy Books series, A Changing Picture Book. With clever acetate pictures that change at the pull of a tab, this imaginative book is a fun way to explore the farm with your child.From big and little to clean and dirty, each spread focuses on opposites on the farm, with engaging rhymes and colourful illustrations.Children can pull the tab and watch the pictures change to reveal a surprise!