Attenborough and the Giant Dinosaur

In 2014, a shepherd spotted the tip of a gigantic fossil bone sticking out of the Argentinian desert. Natural history legend David Attenborough tells the incredible story of the discovery and reconstruction of the world's largest-known dinosaur, a new species of titanosaur. Measuring 37m long and weighing 70 metric tons, it now holds the record as the biggest animal ever to walk the Earth.