Record-breaking dinosaur had neck longer than a school bus and weighed 70 tonnes.

The longest-necked dinosaur on record, Mamenchisaurus sinocanadorum, had a 49.5-foot-long neck, more than six times the length of a giraffe's neck and about 10 feet longer than a school bus. The sauropod lived about 162 million years ago during the Jurassic period in what is now the Xinjiang Uyghur Autonomous Region of northwestern China. The dinosaur evolved to keep its tremendous neck lightweight but sturdy, with air making up as much as 77% of the vertebrae's volume. The long neck would have made the animal an efficient forager, able to graze on the huge volumes of browse necessary to fuel such a huge body before moving to the next vegetation-rich spot.