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.
Museum of Natural and Cultural History/University of Oregon