Marine mammal biology studies mammals such as whales, seals, polar bears, etc. that rely on the aquatic ecosystem for their existence. These animals are grouped together as they have a paraphyletic relation or share a common ancestor. This book is a valuable compilation of topics, ranging from the basic to the most complex theories and principles in the field of marine mammal biology. Also included in this text is a detailed explanation of the various concepts and insights of aquatic ecosystem. The contents of this text are of utmost significance and are bound to provide incredible insights to the readers.