Titanosaurs: the largest animals ever to walk the Earth

A new species of dinosaur discovered in Argentina is forcing scientists to tackle some improbable questions

How do you eat a skip full of food every day without ever chewing? How do you walk on tiptoes when you're the length of four London buses? How do you have sex when you weigh 70 tons? While the answers to these three questions is probably "with great difficulty", scientists are tackling such improbable questions after uncovering what is undoubtedly the biggest dinosaur excavation of all time.

In the spring of 2014, a lone farmer scanned his land, looking for a lost sheep. He thought there was something odd about the rocky ledge his grizzled old sheep was perched on. Dinosaur finds aren't uncommon in the area but the outcrop was huge - could it really be a bone? He called in the scientists. When they determined that the ledge was in fact the 8ft thigh bone of a dinosaur, this sleepy Argentinian farm became the most important dinosaur dig site for more than 100 years.