How heavy is a blue whale's tongue? How lazy is a blobfish? Which fish wrestle with their mouths? Young readers can find out the answers to these questions and more in this fun fact book. With clear, engaging text and vibrant illustrations, kids can get the low-down on the incredible world beneath our oceans in an accessible and entertaining way. Includes:• Deep-sea creatures• Sharks and dolphins• Octopus and squid• Reefs and sea beds With fabulous facts and stats that are great for sharing, this book introduces young minds to the natural world in an engaging and memorable way. Perfect for curious kids aged 7+. ABOUT THE SERIES: Big Ideas! is a dynamic, educational "fun fact" series for children aged seven and up, illustrated throughout with humorous cartoons. Packed with surprising facts, stats, and records that kids will just love to share, it revels in all things weird, unexpected, mind-blowing, funny, and gross!