How Did the Diplodocus Hold its Head Up?

You may experience some neck tension with stress and prolonged sitting at the computer, driving or working at a bench. But think of the poor old Diplodocus, how did they manage to hold their heads up with a 7 metre long neck?  They didn’t have a tall frame on their shoulders and the cables that we see holding up the long boom of the cranes on high-rise building sites.   The Diplodocus used a wonderful structural design which is actually the structural basis of all life forms. It is the