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Free course

Studying mammals: Return to the water

Free statement of participation on completion
Studying mammals: Return to the water
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:

Course learning outcomes

After studying this course, you should be able to:

  • contrast the physical properties of air and water and describe implications of such differences for aquatic mammals
  • give examples of the adaptations displayed by aquatic mammals that enable them to hold their breath while submerged for relatively long periods
  • describe some of the biological differences between pinnipeds, sirenians and cetaceans
  • discuss the importance of communication by sound in aquatic mammals, describe the role of blubber and explain countercurrent heat exchange
  • explain the diving response and its significance in natural dives.

First Published: 09/08/2012

Updated: 15/05/2019

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