A new type of giant long-necked dinosaur, twice the size of a tyrannosaurus rex, has been identified up by scientists from remains dug up in Thailand. The nagatitan, the largest-ever dinosaur found in South-East Asia, weighed 27 tonnes - as much as nine adult Asian elephants - and measured 27m (88ft) in length, longer than a diplodocus. Like that dinosaur, it belonged to the sauropod family of long-necked herbivores. A team of researchers from the UK and Thailand identified the species from