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Megalodon, an extinct giant shark, was a subject of extensive research by Louis Agassiz. This prehistoric creature, estimated to have reached lengths of up to 60 feet, dominated the oceans during the Miocene and Pliocene epochs. Agassiz's contributions to the study of Megalodon include detailed anatomical descriptions based on fossilized remains and teeth, providing valuable insights into the biology and ecology of this formidable predator.