Prehistoric sea monsters

"Teeth, tails, and scales--oh my! Newly independent readers will be transported back to a time when bugs were big and monsters ruled the deep. Each page of this . . . Level 2 reader is packed with . . . facts on the fiercest predators of the ancient oceans. Learn about Megalodon, the largest shark ever to have lived; Jaekelopterus, a human-size scorpion; Helicoprion, a fish whose teeth were in the shape of a circular saw; and more!"--Provided by publisher.