"Who has squashed our bookshelf?" Our teacher asks us all. "Someone's bitten the board in two! There are claw marks on the wall!" For one little boy, a regular day at school is turned upside down. A band of dinosaurs are there to wreak havoc in the classroom, but the grown-ups can't see them! Can he convince the dinosaurs to behave? Prepare for a school day that is far from ordinary in this hilarious new picture book from the bestselling author and illustrator team behind DINOSAURS IN THE SUPERMARKET.