In 2012, a graduate student working in South Africa found the bones of an unknown dinosaur. Some of the bones were sticking out of a field. A team of researchers went to work. After years of excavation, they had uncovered the fossil of a dinosaur no one had ever seen before. It was a relative of the brontosaurus, and it was huge. When it walked the earth 200 million years ago, it weighed 26,000 pounds. Scientists named it “Ledumahadi mafube.” This means “a giant thunderclap at dawn” in Sesotho, a South African language.