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Sea Mammals
Rebecca Stefoff
出版Marshall Cavendish, 2009
主題Juvenile Nonfiction / Animals / GeneralJuvenile Nonfiction / Animals / Marine LifeNature / Animals / Mammals
ISBN07614307259780761430728
URLhttp://books.google.com.hk/books?id=tARCuIkC7nkC&hl=&source=gbs_api
EBookSAMPLE
註釋Mammals originated on land. Millions of years ago, some of them adapted to life in the sea. They were the ancestors of today's sea mammals: whales, manatees, seals, otters, and more. Sea Mammals explores the origins and history of marine mammals, then looks at the many varieties that exist today, from the blue whale-the largest animal that has ever lived-to the vaquita, the world's smallest and most endangered sea mammal. It also focuses on the role of sea mammals in human life, the questions that fascinate marine mammal researchers, and the future of these creatures that share the oceans with fish and reptiles but are biologically closer to bears and elephants. Book jacket.