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The emperor penguin is one of only two penguin species that live on the frozen Antarctic continent. Penguins are flightless seabirds that are skilled swimmers, with streamlined, barrel-like bodies that reduce drag in the water. Their wings are thin, stiff flippers that provide propulsion while swimming. Unlike other birds, which have hollow bones, penguin bones are solid so they can remain submerged underwater. Penguins come ashore to breed, but they are actually marine animals that spend as much as 80 percent of their lives underwater.