Turn the page, and from behind a bush, a stegosaurus unfolds its head, tail, and spine, a blue brontosaurus spirals his tail in a loop-de-loop, and a smiling green monster gnashes his long teeth. It's a dinosaur bash, and the large, friendly pop-ups that burst open right in readers' faces will attract attention, but also a lot of rips and lacerations. These dinos are swell, even if they won't be around long enough to fossilize.