Why did the 'Dragon of Qijiang' have such a long neck?

Scientists think the newly-discovered Chinese dinosaur's elongated neck helped it eat more efficiently.

An international team of palaeontologists has described a newly-discovered species of dinosaur with half of its body length, about 15.2m, made entirely up of its neck. Scientists believe that its height at the shoulder would have been between 1.8m and 2.7m.