Book excerpt: "Otters are often found at zoos and aquariums, but how do these playful animals live in the wild? With 13 different otter species, some are best suited for fresh water and gracefully move on land and in the water; others prefer the kelp forest of the sea using tools to eat their favorite foods. There are many similarities between river otters and sea otters, but there are also vast differences. Explore fascinating facts about these playful, aquatic mammals, meet the species, and awe at the adorable photos in this installment of the Compare and Contrast Book series"--