Description Perhaps you've seen an otter swimming and playing at a zoo or aquarium, but do you know how do these amazing animals live in the wild? Most are found in freshwater habitats, while others make their home in coastal kelp forests or can be found feeding along rocky shores. 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 adorable photos in this latest installment of the Compare and Contrast Book series.