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In a dry riverbed deep within a forest near the Amazon in Brazil, paleontologists uncovered a fossilized jawbone from a previously unknown ancient animal. As their excavation continued, the team found eight more similar jawbones, each about six inches long. However, they did not recover any additional bones that could clearly be matched to a full skeleton.
Even so, these isolated jaws revealed something remarkable. The fossils belonged to a species that lived ...
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