Description Both terrifying and fascinating, sharks are the most well-known creature of the ocean ecosystem. Sharks are a guaranteed hit with young readers, but this book goes beyond basic shark 101 information. Now it's possible for young readers to step into the wild, wonderful life cycle of the Greenland shark, the longest-living vertebrate in the world. Early elementary readers are sure to enjoy the colorful photography of this captivating text, and won't even notice that they're learning key science concepts, like ecosystems and food chains, along the way.