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Researchers Have Discovered, In Peru’s Ica Valley, Fossils Of Perucetus Colossus, A Prehistoric Whale Said To Be The Heaviest Animal To Have Ever Lived On Earth—Possibly Weighing 2-3x The Blue Whale. The Colossal Nature Of The Creature, Which Swam The Seas About 39 Mya, Suggests That It Navigated Shallow Waters Using An Undulating Swimming Technique.