This is a solid non-fiction fact book about Blue Sharks that would appeal to upper elementary students interested in the topic for research or curiosity.  There is information about habitat, diet, threats, physical description, migration and regions.  There is a glossary and index as well as additional resources.  The text is clearly written and the primarily underwater photographs are clear and vibrant.  The series also includes The Whale Shark, The Great White Shark, The Mako Shark, the Oceanic Whitetip Shark, and the Sand Tiger Shark.