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FLIP FLAP  New simulations could end years of debate on plesiosaur motoring. The ancient marine reptiles, one illustrated here, most likely swam using their front flippers for power and their back flippers for steering.


SUPERDUCK  Estimates based on its skull (left) and skeleton put P. bergei at about 9 meters long. Its descendants, B. canadensis (right), didn’t have much bigger skulls, but their crests grew larger.

SABER-TOOTHED RETHINK  One of two recent fossil finds of the extinct saber-toothed salmon is causing a revision of how scientists think the famed teeth looked. They now appear to have stuck out sideways.

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