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Sea Mammals How does the sea otter eat clams? Which is the most ferocious sea mammal? How did the right whale get its name? Which animal is called the sea canary? What is the difference between a dolphin and a porpoise? Why do walruses have tusks? What is the difference between a seal and a sea lion? Do whales migrate in winter? Which whale can dive the deepest? What is the largest animal in the world? What is a dugong? Can polar bears swim?   Previous: Back to Sea Mammals Book: Best Ever Q&A Section: Nature Chapter: Sea Mammals