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| | MSN Encarta - Seal (mammal) |
 | | While the limbs of seals have developed into flippers, the tail has practically disappeared, making seals different from other marine mammals, such as whales, dugongs, and manatees, which have lost their hind legs and use their powerful tails for swimming. |
 | | Seal muscles also store oxygen, and the spleen, an organ that stores oxygen-rich blood, is exceptionally large in seals, serving as a kind of biological scuba tank. |
 | | The Baikal seal inhabits Lake Baikal in southern Russia, believed to be the deepest lake in the world, and the Caspian seal lives in the vast Caspian Sea in southwestern Asia. |
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