27 May 2009
New research by scientists at the University of Portsmouth suggests that giant long-necked dinosaurs like the Diplodocus kept their head high in the air instead of near to the ground.
They compared the 150 million year old dinosaur bones and the skeletons of living animals using X-rays and found similarities in their vertebrae (bones that make up the spine).
Like the modern day giraffe, they think the dinosaur's necks were kept vertical for most of the time, to eat the leaves of high trees. This means that the Diplodocus' head could have been 15 metres above the ground!
Other scientists aren't so sure, and think the height difference between the heart and the brain would mean really high blood pressure - so high, it could be lethal.