Pull the tabs and watch the pictures magically change in A Changing Picture Book: Big Tractor, a fantastic new title by Priddy Books . 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 colorful illustrations . Children can pull the tab and watch the pictures change to reveal a surprise ! Also available in this series: A Changing Picture Book Red Car, Green Car; A Changing Picture Book Peek-a-boo Pumpkin; A Changing Picture Book Fishy, Fishy; A Changing Picture Book Chirp, Chirp; A Changing Picture Book Christmas Surprise; A Changing Picture Book Dinosaur Galore!