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Sea Mammals Why does a walrus have tusks? What is the difference between a seal and a sea lion? How does a seal keep warm? How did the right whale get its name? Why does the elephant seal have an inflatable nose? What is a narwhal's tusk used for? Why do dolphins beach themselves? Are mermaids real? How does a whale leave a 'footprint'? Why do whales spout? Which is the biggest whale? Why do whales sing? What is a sea mammal? Does the killer whale deserve its name?   Previous: Back to Sea Mammals Book: 1001 Section: Nature Chapter: Sea Mammals