In September 2014, paleontologists working in Patagonia, Argentina, uncovered what may be the largest known animal ever to walk the Earth. The dinosaur, named Dreadnoughtus schrani, had an estimated mass of 59 tonnes – equivalent to seven African bull elephants. It was also about 26 metres long – almost as long as a Boeing 737. Dreadnoughtus was a herbivore and likely spent most of its day eating huge quantities of plants just to keep up its massive bulk. Dreadnoughtus also had a long muscular tail that could sweep away predators in one powerful swipe.
For more information about Dreadnoughtus schrani consult this CBC article .