Eric Mack on Dreadnoughtus (great name), the largest dinosaur found yet:
To reach its gargantuan size, Dreadnoughtus would have had to have spent most of its time eating large amounts of plants. The dinosaur’s body was comparable to the size of a house, with a 37-foot-long neck balanced by a 30-foot-long tail. Lacovara says it likely would have spent hours just standing in one place and eating everything it could reach.
The one found in Argentina was 85 feet long and 65 tons — and not yet fully grown.