Jellyfish have roamed the oceans since before dinosaurs lived. This makes jellyfish one of the oldest animals in existence today. Find out more in Jellyfish, one of the titles in the Creatures of the Sea series. This engaging series will teach you about some of the most interesting animals in the world's oceans. Readers will explore the physical features, diets, and natural habitats of these fascinating creatures. Creatures of the Sea is a series of AV2 media enhanced books. A unique book code printed on page 2 unlocks your interactive eBook. These books come alive with video, audio, weblinks, slideshows, activities, and much more.