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Living on land and sustained mainly on a diet of plants and smaller animals; Pakicetus was the earliest known ancestor of the ancient whale. Pakicetus mysteriously vanished from the evolutionary chain when s/he became extinct due to rapidly declining sources of food on land.
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Drinking fresh water, Ambulocetus stayed close to land; rivers and lakes. This evolution shows development of flippers and flatter tails for swimming.
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Kidneys adapt to filter salt-water, making Rodhocetus the first ancestor of the modern whale to enter the oceans.
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Resembling a modern dolphin, Dorudon migrate to polar seas to avoid the constant threat of Monster sharks.
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End.
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