Sticking your neck out: How did plesiosaurs swim with such long necks?

When dinosaurs ruled the land, plesiosaurs ruled the oceans. Famous for their incredibly long necks — some of which were up to 7 meters long — plesiosaurs have remained an evolutionary mystery for hundreds of years. Scientists are now simulating plesiosaur locomotion with 3-D models to understand how they could swim with such long necks.
Paleontology News — ScienceDaily