Life in the Ocean 4 What Makes a Mammal 6 Calves Pups and Cubs 10 The Whale Family 12 Seals and Walruses 16 Manatees and Dugongs 20 Polar Bears 22 Sea Otters 24 Threats to Marine Mammals 26 Glossary 30 For More Information 31 Index 32 CONTENTS
While fish can spend their whole lives under the water’s surface whales have to rise to the surface to breathe This is because whales unlike fish are mammals A mammal is an animal that breathes air has a backbone and grows hair at some point during its life All female mammals can produce milk for their young Animals within this LIFE IN THE OCEAN Humpback whales are very acrobatic marine mammals They often leap out of the water and then arch backward as they fall back down 4
group are among the most intelligent of all living creatures Humans are a part of this group Mammals that live in the world’s oceans are called marine mammals Whales are marine mammals So are seals sea lions walruses manatees polar bears and sea otters Some marine mammals such as whales live their whole lives in the water Others such as polar bears spend part of their time on land Whales and sharks both live in oceans but whales are marine mammals and sharks are fish Compare and contrast the two Compare and Contrast Manatees spend their whole lives in the water These two are off the coast of Florida 5
