This sequel to the award-winning Water Beds: Sleeping in the Ocean (2007 Teacher's Choice and 2005 Mom's Choice) takes listeners on an around-the-world boat ride to learn how mammals sleep in or around nine major rivers of the world on all continents except Antarctica. Row down the Mississippi and watch two river otters slip into a hollow tree, or look to the bank of the Brisbane River as a platypus pops into a hole and disappears into a narrow tunnel. Told in a soothing style, this audiobook serves as a bedtime/naptime story for younger children or an animal geography book for older children. Adults may learn something, too!