Tentacles tangle … Venomous needles sting … Meet the jellyfish! Brimming with vivid photos and scientific facts, this middle-grade nonfiction book treats researchers and marine animal lovers to a comprehensive profile of these invertebrates of the ocean. It covers zoology topics such as anatomy, diet, habitat, and life cycle, as well as species conservation efforts and the ocean animals' relationship with humans throughout history. Sidebars, a range map, and a glossary support the main text, while a Japanese tale about the jellyfish adds a cross-curricular cultural layer to the title.