There is still so little we know about all that happens in the world's vast oceans. The dark depths beneath the waves are a mysterious realm that scientists are still exploring. That means there's plenty of freaky creatures we don't yet understand or haven't yet seen, hiding in the blackness. Readers will delight in learning about otherworldly and ghastly sea animals, such as the prehistoric-looking frill shark and the fierce anglerfish. They'll even...