Did you know that manatees can live in both salt and fresh water? Or that baby elephant seals are called weaners? Or that sea otters have almost a million hairs per square inch? There are so many fascinating facts about mammals, young readers will dive right into this alphabetical exploration of the world’s sea life. And they’ll learn there isn’t a sea mammal that begins with X, and how hard Jerry Pallott a tried to find one. While Jerry was unsuccessful, readers will learn that research takes you to many places and introduces you to many people.