(PhysOrg.com) -- In a recent study published in Biology Letters, Professor Graeme Ruxton from the University of Glasgow and Dr. David Wilkinson from Liverpool John Moores University use mathematics and a comparison to the old 1950s style vacuum cleaners to explain the benefits of the very long necks seen in dinosaurs like the Brachiosaurus.
Dinosaurs like the Brachiosaurus and Diplodocus, who roamed the Earth from 200 hundred million years ago to their extinction 65 million years ago, had extremely heavy bodies and very long necks. Debate between the scientific communities has been going on for years as to just why their necks were so long and what its purpose was.
Many believed that these long necks would have been used to forage for high, hard to reach foliage, similar to that of a giraffe. However, other paleontologists believe that in order for these dinosaurs to raise their necks up high, the blood pressure required to get blood to the brain would have been too much to be feasible.
Looking at the basic body design of these dinosaurs, the team of researchers could best describe them as like the old style vacuum cleaners of the 1950s. With a large and cumbersome cylindrical body and a long reaching hose with a vacuum head, these vacuums worked in a similar manner to what they believe the dinosaurs did.
While these vacuums were generally placed in the center of a room and the long hose extension used to vacuum and reach places without having to move the central body, so did the dinosaurs. With their large bodies, the long necks allowed the dinosaurs to forage over more ground without having to expend energy by moving their bodies.
Using mathematics to prove their theory, the researchers determined that the ideal neck length would have been around nine meters long. By keeping their body in one location and using their neck to forage, they were able to cut their energy output by as much as 80 percent.
Explore further: Some sauropods really did hold their long necks high
The energetics of low browsing in sauropods, Biology Letters, Published online before print March 23, 2011, doi: 10.1098/rsbl.2011.0116