The penguin is the only bird that can swim, but cannot fly. Penguin parents take turns taking care of the eggs for eight weeks. Penguins have a peculiar gland helping them cope with lack of fresh water. The gland is located close to their beaks so when they drink saltwater from the sea, it goes through the gland which in turn retains the salt. When the gland is full of salt, the penguin knocks his beak against a rock and all the salt empties out.
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