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A monstrous shark, predating whales, great whites, or even the bus-sized megalodon, once prowled the waters off what is now northern Australia during the Cretaceous period.
Researchers, studying huge vertebrae discovered near Darwin, have identified this creature as the earliest known mega-predator of the modern shark lineage.
It lived an astonishing 15 million years earlier than any enormous sharks previously found.
This ancestor of today’s 6-metre (20-foot) g
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