"From the creators of the popular podcast But Why comes a new series for curious kids answering their most peculiar questions! Complete with real-life photos and hilarious illustrations, this book will keep young readers engaged and entertained as they dive into the pages and the deep blue sea!"-- Provided by publisher.

The salty sea and the wild ways of waves -- Shellfish: hermit crabs, oysters, and clams that squirt -- Crustaceans: crabs, shrimp, and lobsters that pinch -- The ocean's geography and the mystery of challenger deep -- Are seahorses... horses? And other questions about fish -- Octopuses and the curious case of regenerating limbs -- Singing whales, dancing dolphins, and the enigmatic Narwhal -- A (brief) history of the ocean and global trading -- Sharks! -- Sea lions, walruses, and seals that back -- The ocean and you!