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Mammals come in a bewildering variety of shapesand sizes and yet all of the 4700 or so species have some characteristics incommon, which justifies the inclusion of diverse types within a single group.Although mammals evolved on land, a number of species have become adapted tospending part or all of their lives in water and it is these mammals that youare going to concentrate on in this course. You will meet some aquatic mammals,find out how we can study them, consider their evolutionary history and readabout human impacts on one iconic group.