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Some of the most unusual and versatile of all the mammals are the groups that live, feed and reproduce underwater. In this free course, Studying mammals: Return to the water, we will see how these formerly land-based mammals adapted to a return to the water, discussing such challenges as breathing, movement and communication. This is the seventh course in the Studying mammals series.NOTE: The Studying mammals series is gradually being updated and replaced. You can study an improved freestanding version of this course, titled Aquatic mammals, here:https://www.open.edu/openlearn/nature-environment/aquatic-mammals/content-section-0
