Another claim of a large anaconda was made by British adventurer Percy Fawcett.
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On the episode "Amazon Assassins" of River Monsters, Jeremy Wade was trying to find and catch a large Arapaima when locals told him about the "Cobra Grande", a giant snake different from the anaconda.
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The Old Tupi name for such snakes was mbói, which figures in the etymology of names such as jibóia and boitatá (the Brazilian name for the mythical giant anaconda).