Did you know that the legendary Hercules fought against the hydra, a sea monster with many heads? Or that the giant squid is powerful enough to use its 30-foot-long tentacles to turn a whale into prey? Enormous creatures still lurk in the depths of the ocean! Embracing children's delight in the mythical creatures while also imparting fascinating facts about the real ones, discover the history of these special animals and decide for yourself if you believe in sea monsters!