SUMMARY: -Megalodon may have been the largest marine predator that has ever lived. Megalodon was an apex predator, or top carnivore, in the marine environments it inhabited, 65 million years ago, the biggest animals on earth were confined to the world's oceans—as witness the 50-foot-long, 50-ton prehistoric sperm whale -Leviathan is an extinct genus of sperm whale containing one species: L. melvillei. Its name was inspired by the biblical sea monster Leviathan -Brygmophyseter, known as the biting sperm whale, is an extinct genus of toothed whale in the sperm whale family with one species. -Aulophyseter is an extinct genus of sperm whales from the Miocene formations of the west and east coasts of North America. -Rhamphosuchus is an extinct relative of the modern false gharial. It inhabited what is now the Indian sub-continent in the Miocene. It is only known from incomplete sets of fossils,
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