Throughout the film, plesiosaurs are shown holding their long necks above the water's surface, like a swan. However, their musculature could not support such a pose, nor could their neck vertebra allow this movement.
Hunting for new 3D releases (there are too few good ones actually) this Bluray was recommended to me by a salesperson in the store. I was positively surprised. Unlike other cheap 3D productions trying to jump on the bandwagon for a few quick bucks this Bluray has a good script, excellent 3D animations as well as educational value. My kids liked the way how the earths history has been graphically presented. The script and expert statements are good. It leaves you with this awe on how little we actually know about earths development and history. And obviously: More than 99% of all species that ever lived on the planet are extinct today.